Help:Extension:Translate/Page translation administration/it

<translate> Documentation for <tvar|ext>Estensione:Traduzione</></translate>

<translate> Translators</translate> (<translate> main help page</translate> )

<translate> Translation administrators</translate>

<translate> Sysadmins and developers</translate>

<translate> Translate this template</translate>

Cos'è. La funzionalità di traduzione delle pagine permette traduzioni controllate delle pagine wiki in altre lingue. Ciò significa che il contenuto di ogni traduzione sarà, di solito, uguale a quello della pagina sorgente. A differenza, per esempio, dalle versioni nelle varie lingue degli articoli sulle diverse Wikipedie, che sono pienamente indipendenti l'una dall'altra. Si presume che le pagine vengano solamente tradotte da un linguaggio primario ad un altro, ma i traduttori possono anche approfittare delle traduzioni in altre lingue, se queste esistono.

Perché. Senza alcun aiuto, tradurre più di qualche pagina in altre lingue diventa nel migliore dei casi una perdita di tempo, nel peggiore una confusione ingestibile. Con la funzionalità di traduzione delle pagine puoi evitare la confusione e dare una struttura al processo di traduzione. L'idea principale è che il testo sorgente viene segmentato in unità più piccole, ognuna delle quali verrà tradotta individualmente. Quando il testo sorgente viene segmentato in unità, tutti i cambiamenti possono essere isolati e i traduttori devono solamente aggiornare le unità di traduzione che hanno subito modifiche nel testo sorgente. Ciò permette inoltre ai traduttori di lavorare su unità con una dimensione gestibile, in modo tale da condividere il lavoro tra più traduttori o continuare la traduzione in sessioni successive, perché non c'è bisogno di farlo tutto in una volta.

Chi. Questa pagina approfondisce il tutorial di traduzione delle pagine fornendo una panoramica più dettagliata su come lavora il sistema e suggerisce le migliori pratiche per una gran varietà di casi. Questa pagina è rivolta agli amministratori di traduzione di pagine e in generale a chiunque modifica il testo sorgente delle pagine traducibili, anche senza avere accesso alle funzionalità amministrative per l'approvazione dei cambiamenti delle traduzioni.

To apply for extended rights as a translation administrator on MediaWiki.org, go to Project:Requests. As for requests on Meta, see Meta:Requests. For Commons, Commons:Noticeboard.

Vita di una pagina traducibile

Ruoli. Più persone sono coinvolte nel processo di scrittura e traduzione di una pagina wiki: lo scrittore iniziale crea una pagina, qualcuno corregge gli errori di battitura, un amministratore delle traduzioni segnala la pagina per la traduzione, i traduttori traducono, qualcuno apporta delle modifiche alla pagina, un amministratore delle traduzioni segnala questi cambiamenti per la traduzione e i traduttori aggiornano le traduzioni. Questi ruoli possono più o meno sovrapporsi, ma la responsabilità ultima per una traduzione senza problemi è dell'amministratore delle traduzioni. L'amministratore decide quando la pagina è pronta per la traduzione, si assicura che la segmentazione sia corretta e approva (o corregge) i cambiamenti.

Preparazione. Per avere qualcosa di tradotto devi prima scriverlo. Se hai già effettuato traduzioni senza l'estensione Translate, vedi di seguito la sezione sulla migrazione delle traduzioni. Se vuoi tante traduzioni velocemente, è cruciale che il testo sorgente sia in buono stato. Prima di segnalare una pagina per la traduzione, chiedi a qualcun'altro di controllarla e se possibile chiedi ad un "language specialist" di rendere il testo più chiaro e conciso. L'uso di un vocabolario complesso e di frasi difficili da capire costituiscono un freno alle traduzioni di molti volontari. Anche il markup può provocare problemi ai traduttori, ma come amministratore delle traduzioni puoi evitare tali difficoltà, vedi la sezione relativa alla gestione del markup qui sotto. Naturalmente le modifiche che apporti al testo sorgente della traduzione obbligano all'aggiornamento di tutte le traduzioni esistenti, quindi è meglio attendere finché i contenuti della pagina non si sono stabilizzati. D'altro canto, i cambiamenti avvengono, e il sistema li gestisce bene, quindi dai un'occhiata alla sottostante sezione riguardante la gestione delle modifiche.

Etichettatura. Quando il testo è pronto per la traduzione, chiunque può marcare le parti traducibili includendole all'interno delle etichette ‎<translate> e aggiungendo alla pagina la barra ‎<languages />. Quest'ultima aggiunge una lista di tutte le traduzioni della pagina, con le percentuali di completamento e aggiornamento. Non ci sono altre indicazioni dell'esistenza delle traduzioni. Vedi in basso come realizzare l'etichettatura. Il sistema rileverà quando le etichette sono presenti sulla pagina traducibile, e la pagina avrà un collegamento per marcarla per la traduzione. Inoltre se per esempio ti sei dimenticato di aggiungere un'etichetta di chiusura ti avviserà e prevenirà il salvataggio. La pagina traducibile verrà inoltre elencata in Special:PageTranslation come pronta per la marcatura.

Marcatura. Dopo l'etichettatura, un amministratore di traduzione marca la pagina per la traduzione. L'interfaccia viene spiegata in questo esempio di traduzione di una pagina. La responsabilità dell'amministratore di traduzione è di assicurare che la segmentazione abbia senso e che l'etichettatura sia stata fatta correttamente. La pagina può essere marcata nuovamente se nel frattempo è cambiata. Vedi sotto come effettuare modifiche che causino disturbi minimi. La marcatura della pagina avvia un processo in background che usa la coda di operazioni di MediaWiki. Questo processo analizza ogni pagina di traduzione e la rigenera; i cambiamenti nel template della pagina di traduzione saranno rispecchiati e le traduzioni non aggiornate saranno temporaneamente rimpiazzate con il testo sorgente originale. Diversamente, l'interfaccia di traduzione viene aggiornata immediatamente.

Cambiamenti. Gli utenti possono continuare ad apportare modifiche al testo sorgente della pagina traducibile. I cambiamenti saranno visibili agli utenti che visualizzano la pagina nella lingua di origine, ma le traduzioni vengono effettuate rispetto alle unità di traduzione estratte dall'ultima versione della pagina traducibile che è stata contrassegnata per la traduzione: le pagine traducibili sono segnate come aggiornate al 100% se tutte le unità di traduzione sono state tradotte, anche se la pagina sorgente presenta delle nuove modifiche. Puoi facilmente vedere se ci sono cambiamenti non marcati quando visualizzi la pagina traducibile nel linguaggio sorgente: c'è una nota in alto che dice che puoi tradurre questa pagina e che presenta un collegamento ai cambiamenti se ce ne sono.

Invalidazione. Se vengono apportate modifiche al sorgente della pagina traducibile, l'amministratore della traduzione avrà la possibilità di scegliere "Do not invalidate translations" per ogni sezione. If a section is invalidated, then the translated languages will get a pink background color for those sections, and a clock icon will be shown to translators in the translation interface. If a section is not invalidated, then no changes will be visible to readers of the translated pages, and translators will have to examine the section within the translation interface in order to see the changes.

Source language. There is also a translation page with the language code of the source language: it doesn't contain the extra tags and other markup related to page translation which are used in the translatable page source. This page is not linked from the interface, but it is handy for example when you want to transclude the page (typically for translatable templates) or export it. For example, the page you're on is available without markups at Help:Extension:Translate/Page translation administration/en.

Changing the source language. The extension will normally assume that the translatable source page is in the wiki's default language. Administrators can change a specific page's language setting, using the Special:PageLanguage page, so that it can be used as a source page for translation. See Page content language for details.

Translation language. Translation pages may contain text in different languages if it is not fully translated. On translation pages, untranslated translation units will be tagged with appropriate language and text direction so that CSS rules are applied correctly. MediaWiki, however, does not currently allow setting the language for parsing other than at the page level. All magic words and parser functions use the translation target language, even if the surrounding text is not translated. This can create an unwanted mismatch for example when formatting numbers or dates. Some magic functions and parser tags allow setting the output language, in which case you can use magic word {{TRANSLATIONLANGUAGE}} that returns either the source language for untranslated units or the target language for translated units.

Closed translation requests. Some translatable pages have a content that is only interesting for a certain period of time. For example announcements and regular status updates, like the Wikimedia monthly highlights. You can keep those pages around with translations, but hide them from the translation interface. This does not prevent further translations to the pages, but it greatly reduces the chance that a user accidentally starts translating the page. Discouraging and its reversion are done from Special:PageTranslation.

Prioritizing languages. You can also define a list of languages that you specifically want translations into; leaving the language list empty is interpreted as all languages allowed. The page will behave like a discouraged page (see previous paragraph) for the languages not in the priority list and, when translating into them, translators will be given a notice. You can also prevent the translation in other languages, say if translations are actually used elsewhere and you won't be able to use them but in some languages.

Grouping. It is possible to group related pages together. These groups work like all the other message groups. They have their own statistics and contain all the messages of the subgroups: in this case translatable pages. This functionality is currently in Special:AggregateGroups. Aggregate message groups are collapsed by default in Special:LanguageStats in the group selector at Special:Translate.

Moving. You can move translatable pages as you would move any other page. When moving you can choose whether you want to move any non-translation subpages too. The move uses a background job to move the many related pages. While the move is in progress, it is not possible to translate the page. Completion is noted in the page translation log.

Deleting. Like move, deletion is accessed from the normal place. You can delete either the whole translatable page, or just one translation page, from the delete button on it. Deletion will also delete all the related translation unit pages. As in move, a background process will delete the pages over time and completion is noted in the page translation log. Deletion requires "delete" and "pagetranslation" permission, but individual translation unit pages can always be deleted with standard "delete".

Reverting. Similarly, reverting incorrect edits works as usual (including the rollback button): you only have to edit the affected translation unit and the translation page will be updated as well. To find the edit to the translation unit from the edit to the translation page, just click the "contribs" link for the editor and look for an edit at a similar time. Within the translation system, you can mark an existing translation as outdated by adding !!FUZZY!! at the start of the translation unit's translated message box.

Protecting. It is possible to protect the translatable page. Translation pages cannot be protected, nor does the protection of the translatable page extend to them. To prevent further edits to translations, you should add the source language as only priority language and disable translations to other languages, see prioritizing languages above. Together these two actions effectively prevent changes to both the source page and translation pages with its translation unit pages. It is possible to protect individual translation unit pages, though it is not advisable.

Removal from translation. It is also possible to unmark a page for translation. You can use Special:PageTranslation or follow the link in the top of translatable page to remove it from translation. This will remove any structure related to page translation, but leave all the existing pages in place, freely editable. This action is not recommended.

Language aware transclusion. It is possible to transclude a translatable page into another page as a template. In such a case, the translatable page will be loaded in the language of the target page if it has been translated to that language. If that translation does not exist, the translatable page will be loaded in the source language. This behavior of a translatable page is controlled by the Enable translation aware transclusion for this page option when marking the page for translation. New translatable pages will have this behavior turned on by default.

Struttura di una pagina da tradurre

The translation of a translatable page will produce many pages, which all together compose the translatable page in the broadest sense: their title is determined by the title of the translatable Page:

Page - the source page
Page/<language code> - the translation pages, plus a copy of the source page without markup
Translations:Page/<translation unit identifier>/<language code> - all the translation unit pages

In addition to this, there are the translation page template and the sources of translation units, extracted from the source page and stored in the database. The system keeps track of which versions of the source page contain translation tags and which version of them have been marked for translation.

Every time a translation unit page is updated, the system will also regenerate the corresponding translation page. This will result in two edits. The translation unit page edit is hidden by default in recent changes and can be shown by choosing show translations from the translation filter. Any action other than editing (like deleting and moving) the translation unit pages will not trigger the regeneration of the corresponding translation page.

If you need the copy of the source page without markup, e.g. to be pasted in another wiki without Translate,

identify the source language code (for English, en) and visit Page/<language code>

click the "View history" button to reach an address like this and replace action=history with action=raw in the address bar, press enter

the text will be displayed or saved.

Segmentazione

Principi generali

Tutto il testo destinato alla traduzione deve essere circondato da etichette ‎<translate>. Puoi avere poi avere varie etichette in una sola pagina.
Everything outside those tags will not change in any translation page. This static text, together with the placeholders which mark the place where the translation of each translation unit will be substituted, is called the translation page template.
Too much markup in the text makes it difficult for translators to translate. Use more fine grained placing of ‎<translate> tags when there are lots of markup.
The text inside ‎<translate> tags is split into translation units where there is one or more empty lines between them (two or more newlines).

Restrictions. The page translation feature places some restrictions on the text. There should not be any markup that spans over two or more translation units. In other words, each paragraph should be self-contained. This is currently not enforced in the software, but violating it will cause invalid rendering of the page, the severity depending on whether MediaWiki itself is able to fix the resulting HTML output or not.

Parsing order. Beware, the ‎<translate> tags work differently from other tags, because they do not go through the parser. This should not cause problems usually, but may if you are trying something fancy. In more detail, they are parsed before any other tags like ‎<pre> or ‎<source>, except for ‎<nowiki> which is recognized by the Translate extension.

Before Translate version 2020.10, ‎<nowiki> was not handled consistently and pages would still appear in Special:PageTranslation. Escape it like "<translate>...</translate>" as a workaround.

Tag placing. If possible, try to put the tags on their own lines, with no empty lines between the content and the tags. Sometimes this is not possible, for example if you want to translate some content surrounded by the markup, but not the markup itself. This is fine too, for example:

{{Template|1=<translate>Some localised parameter</translate>}}

To make this work, the extension has a simple whitespace handling: whitespace is preserved, except if an opening or closing ‎<translate>‎</translate> tag is the only thing on a line. In that case the newline after the opening tag or before the closing tag is eaten. This means that they don't cause extra space in the rendered version of the page.

Variables. It is possible to use variables similar to template variables. The syntax for this is ‎<tvar name="name">contents‎</tvar> (quotes are optional if the value contains no spaces or any of " ' ` = < >). For translators these will show up only as $name, and in translation pages will automatically be replaced by the value defined in the translatable page (so they are global "constants" across all its translation pages). Variables can be used to hide untranslatable content in the middle of a translation unit. It also works for things like numbers that need to be updated often. You can update the number in all translations by changing the number in the translatable page source and re-marking the page. You do not need to invalidate translations, because the number is not part of the translation unit pages.

Before Translate version 2021.04, the syntax was <tvar|name>contents</> (T274881). This syntax is still supported, but it is deprecated.

Comma-separated values. For content such as Graph data, that needs to be parsed by the software as comma-separated values, you should separate the translation units between each comma, so that the translating editors don't use localized commas which will confuse the software.

Plain-text values. To prevent any kind of modification of the translation value, use nowrap attribute like this: <translate nowrap>...</translate>. By default outdated and untranslated values are modified in order to support highlighting and language tagging.

Esempi di Markup

Below are listed some alternatives and suggested ways to handle different kinds of wiki markup.


Categorie	Categories can be added in two ways: in the translation page template or in one of the translation units. If you have the categories in the translation page template, all translations will end up in the same category. If you have categories inside translation units, you should teach the users a naming scheme. On the right we show two possible schemes which are independent of the technical means to adopt them.	Translation by adding language suffix: Category:Cars/fi (recommended) [...] </translate> [[Category:MediaWiki{{#translation:}}]] Category page name not translated (just like the page names). One category for each language. Page translation could be used for the category itself: the categories would be linked together and the headings would be translated (but not the name of the category in links and such). No traduzione: Category:Cars Tutte le traduzioni nella stessa categoria (buono solo se ci sono pochi linguaggi, pessimo se ne sono molti). Nome di categoria non tradotto (può essere messa come traduzione nel template).
Intestazioni	Headings should be separated with an empty line. This way someone can quickly translate the table of contents before going into the contents, and an anchor in source language is added on translation pages. When tagging headings, it is important to include the heading markup inside the tags and insert a newline between the opening translate tag and the heading markup, or MediaWiki will no longer identify them properly. For example, section editing only works with the recommended mark-up given in the example. The markup also immediately gives translators a context: they are translating a heading. Additionally, it ensures that linkable anchors are generated for the heading.	Wrong: (no newline after `‎<translate>` tag, heading out of translate tags) == <translate>Culture</translate> == Sbagliato (no newline) <translate>== Culture ==</translate> Segmentazione raccomandata: <translate> == Culture == Lorem ipsum dolor. </translate>
Immagini	Images that do contain language specific content like text should include the full image syntax in an unit. Other images can only tag the description with optional hint in message documentation of the page after it has been marked.	<translate> [[File:Europe.png\|thumb\|Map of Europe with capital cities]] </translate> [[File:Ball.png\|50px\|<translate>Ball icon</translate>]]
Collegamenti	Links can be included in the paragraph they are inside. This allows changing the link label, but also changing the link target to a localized version if one exists. If the target page is (or should be) also translatable, you should link to it by prepending `Special:MyLanguage/` to its title. Only the link label will need to be translated, because this automatically redirects users to the translation page in their own interface language, as selected for instance via the UniversalLanguageSelector. However, to achieve a constant behavior the syntax must be used for all links.	Collegamenti interni <translate> Helsinki is capital of [[Finland (country)\|Finland]]. </translate> Collegamenti a pagine traducibili: <translate> It has marvelous beaches with a lot of [[Special:MyLanguage/Seagull\|seagulls]]. </translate> Collegamenti esterni <translate> PHP ([http://php.net website]) is a programming language. </translate>
Liste	Lists can get long, so might want to split them into multiple parts with one item in each unit. Do so only if the items are sufficiently independent to be translated separately in all languages: don't create "lego messages". For instance, you must avoid to split a single sentence in multiple units, or to separate logically dependent parts which may affect each other (with regard to punctuation or style of the list, for instance). To split a list, use `‎<translate>`-tags for each item without including leading asterisks/hashes/semicolons. Do not insert blank lines as this will break the HTML output.	* <translate>Principi generali</translate> * <translate>Headings</translate> * <translate>Immagini</translate> * <translate>Tabelle</translate> or <translate> Please visit: * our main page * then the FAQ page. </translate>
Numeri	With numbers and other non-linguistic elements you may want to pull the actual number out of translation and make it a variable. This has multiple benefits: You can update the number without invalidating translations. Translation memory can work better when the changing number is ignored.	<translate> Income this month <tvar name=income>{{FORMATNUM:3567800}}</tvar> EUR </translate> Note that this prevents the translators from localising the number by doing currency conversion. The `FORMATNUM` call makes sure the number is formatted correctly in the target language.
Template	Templates have varying functions and purposes, so the best solution depends on what the template is for. If the template is not a part of longer paragraph, it should be left out, unless it has parameters that need to be translated. If the template has no linguistic content itself, you don't need to do anything for the template itself.	For an example of templates translated with page translation, see Template:Extension-Translate . To use this template, you need to have another template similar to {{Translatable navigation template }}, because you cannot include the template by `{{TemplateName}}` anymore. This is not yet provided by the Translate extension itself, but that is in the plans. Another way is to use the unstructured element translation to translate the template, but then the language of the template will follow the user's interface language, not the language of the page they are viewing.
Attributes	By default the Translate extension may wrap outdated translation units to highlight them and untranslated units to set proper language metadata. In some circumstances the additional markup added by this wrapping is not suitable.	<abbr title="<translate nowrap>Frequently asked questions</translate>"><translate>FAQ</translate></abbr>

Translation language <translate> (introduced in <tvar	When text is using language-dependent formatting methods, a mismatch may appear for untranslated sections. `{{TRANSLATIONLANGUAGE}}` can be used to avoid that.	2020-09-15 is {{#time:l\|2020-09-15\|it}} The above input may render as: English: 2020-09-15 is Tuesday. Finnish: 2020-09-15 on tiistai. Without the magic word, untranslated text on a Finnish translation page would render as: 2020-09-15 is tiistai
Translated page language <translate> (introduced in <tvar	Translated templates may want to set the language they are actually in (e.g. on a wrapper HTML element). When used outside of `‎<translate>` tags, `{{TRANSLATIONLANGUAGE}}` returns the language of the page it’s directly in (as opposed to the language of the page on which the reader sees it).	Suppose `{{1/en}}` is transcluded in the page titled `2/de`. If `{{PAGELANGUAGE}}` is used in the text of `{{1/en}}`, it returns `de`. If `{{TRANSLATIONLANGUAGE}}` is used in the text of `{{1/en}}` (outside of `‎<translate>` tags), it returns `en`.

Translatable page <translate> (introduced in <tvar	It can be used in templates that are transcluded on both translatable and non-translatable pages, and should behave differently depending on whether the page is translatable (e.g. use user language on non-translatable pages). It returns the title of the translation page (the page other languages are translated from) if a page is translatable (including translated pages), and nothing if the page is not translatable. Similarly to the `‎<languages>` parser tag, it returns nothing if the page contains translation markup but hasn’t been marked for translation yet.	{{#if:{{TRANSLATABLEPAGE}}\|{{Some template}}\|{{Some template/{{int:lang}}}}}} Assuming `Template:Some template` is a translatable template with language-aware transclusion (see above) enabled, and MediaWiki:lang and its translations are set up on the given wiki similarly to mediawiki.org, the above code transcludes it in the page language on translatable pages, and in the UI language on other pages.

Cambiare il testo sorgente

Principi generali

Evita di modificare
Fai modifiche quanto più isolate possibile
Non aggiungere tu altri marcatori di unità di traduzione

Unit markers. When a page is marked for translation, the system will update the translatable page source and add unique identifiers, called "unit markers", for each translation unit. See example below. An example of a unit marker is . These unit markers are crucial for the system, which uses them to track changes to each translation unit. You should never add unit markers yourself. The unit markers are always on the line before the unit; or, if it starts with a heading, after the first heading on the same line. The different placement for headings is needed to keep section editing working as expected.

<translate>
== Birds == <!--T:1-->
Birds are animals which....

<!--T:2-->
Birds can fly and...
</translate>

Changing unit text. Changing is the most common operation for translation units. You can fix spelling mistakes, correct grammar or do other changes to the unit. When re-marking the page for translation, you will see the difference in the unit text. The same difference is also shown to translators when they update their translations. For simple spelling fixes and other cases where you don't want the existing translations to be highlighted on the translated pages, you can avoid invalidating them: translators will still see the difference if they ever update the translation for any reason.

Adding new text. You can freely add new text inside ‎<translate> tags. Make sure that there is one empty line between adjacent units, so that the system will see it as a new unit. You can also add ‎<translate> tags around the new text, if it is not inside existing ‎<translate> tags. Again, do not add unit markers yourself, the system will do it.

Deleting text. You can delete whole units. If you do so, also remove the unit marker.

Splitting units. You can split existing units by adding an empty line in the middle of a unit, or by placing ‎<translate> tags so that they split the unit. You can either keep the unit marker with the first unit or remove it altogether. In the first case, translators see the old text when updating the old translation. If you removed the unit marker, both units will behave as if no translation ever existed, after the page is re-marked for translation.

Stato originale

Keeping the marker

Eliminare il marcatore

<!--T:1-->
Cat purrs. Dog barks.

<!--T:1-->
Cat purrs.

<!--T:2--> (Aggiunto dopo aver ri-segnato per la traduzione)
Dog barks.

<!--T:2--> (Aggiunto dopo aver ri-segnato per la traduzione)
Cat purrs.

<!--T:3--> (Aggiunto dopo aver ri-segnato per la traduzione)
Dog barks.

Kissa kehrää. Koira haukkuu.

Dog barks.

Cat purrs.

Dog barks.

Merging units. If you merge units, you have to remove at least all but one unit marker.

Moving units. You can move units around without invalidating translations: just move the unit marker together with the rest of the unit.

Before marking the new version of the page for translation, ensure that the best practices are followed, especially that translators get a new translation unit if the content has changed. Also make sure that there are no unnecessary changes to prevent wasting translators' time. If the source page is getting many changes, it may be worthwhile to wait for it to stabilize, and push the work for translators only after that.

Unused unit translations are not deleted automatically, but that should not cause trouble.

Migrating to page translation

If you have been translating pages before using the page translation system, you might want to migrate the pages to the new system, at least the ones you expect to have new translations and want statistics for. You will probably have existing templates for language switching and maybe different page naming conventions.

You can start migration by cleaning up, tagging and marking the source page. You can keep the existing language-switching templates while you migrate the old translations. If your pages follow the language code subpages naming convention, they will be replaced with the source text after marking the source page for translation, but you'll still be able to access translations from history.

This manual task has been partly automated by Special:PageMigration (available to translation administrators only), which shows the source and target units besides each other and allows the user to adjust the units by providing a set of features mentioned later in this page.

How to use?

File:Page migration screenshot.png

Screenshot showing an example use of Special:PageMigration for "Help:Special pages" as page name and "fr" as language code.

Go to Special:PageMigration
Enter the title of the page and the language code. For example, "Help:Special pages" & "fr"
The source text which was divided into units by Translate and the imported translations will be shown besides each other with some initial alignment.
Use the actions available for each unit to manually do the remaining alignment
As translated units are editable, do required manual improvements (for add translation variables, fix links and markup, etc.)
Click on the "Save" button. This will create pages under the Translations namespace of the form Translations:Page/<translation unit identifier>/<language code>. The old translations have been imported into Translate.
Else, if you wish to abort the importing, click on the 'Cancel' button.

Actions available

Each row consisting of source and target unit has a set of action icons. They are used as follows:

Add: Clicking on this action icon adds a new empty unit below the current one. Use this feature if you want to split the current unit and need a unit below.
Swap: Clicking on this action icon swaps the content of the current unit with the unit below it. You can use this feature when the units get aligned improperly due to different ordering of sections. Or when you need to drag a unit below or above. In either case, remember it swaps with the unit below and does not create any additional units.
Delete: Clicking on this action icon completely removes the corresponding target unit from the page and shifts the remaining target units up by one unit. Use this to remove unwanted content like code or imported translations which are present completely in the source language. Note: this irrevocable action (in the current session).

Troubleshooting

If you mark a page for translation and immediately go to the special page and try to import translations, you may get an error message like "Page <page-name>/<language-name> does not contain old translations.". This is because FuzzyBot didn't fuzzy the messages on the old page yet: the tool won't find an edit by FuzzyBot on the translation page. In this case, simply wait for FuzzyBot to do its job. Once an edit is seen, you can proceed with the imports.
Please wait for some time after pressing the "Save" button. While the button background remains gray, there is an ongoing process of importing non-empty units. Once the button becomes colored again, the import is completed.
Within the translation system, you can mark an existing translation as outdated by adding !!FUZZY!! at the start of the translation unit's translated message box.

Tips

Migration will be easier if you first (before the mark to translation) check whether existing translations are similar to the original English text, and manually edit the structure of pages: break paragraphs and lists, add the missing headings (even if empty).
Will be useful to check the result in the core translation interface - some of the units may be immediately marked as obsolete because of errors markup or if not all of the translation variables was added.
Translation of the page title will have to be added manually. If you do not know very well the language of the imported page, you can try to find the translation of the page title among the "links here" or sometimes in redirects.