Manual:$wgExtraLanguageNames/de-formal

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<translate> Language, regional and character encoding settings</translate>: $wgExtraLanguageNames
List of language names or overrides for default names in Names.php.
<translate> Introduced in version:</translate>	1.12.0 (r28212)
<translate> Removed in version:</translate>	<translate> still in use</translate>
<translate> Allowed values:</translate>	(array of strings)
<translate> Default value:</translate>	`[]`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

List of language names or overrides for default names in includes/languages/data/Names.php .

$wgExtraLanguageNames['xyz'] = 'Language name';

Notes

You may need to also add the prefix to $wgExtraInterlanguageLinkPrefixes for it to actually behave as an interlanguage link when defined.