mediawiki.language.fallback.js
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mediawiki.language.fallback.js
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	/*
	* Language-fallback-chain-related utilities for mediawiki.language.
	*/
	( function () {

	Object.assign( mw.language, {

	/**
	* Get the language fallback chain for current UI language (not including the language itself).
	*
	* @memberof mw.language
	* @return {string[]} List of language keys, e.g. `['de', 'en']`
	*/
	getFallbackLanguages: function () {
	return mw.language.getData(
	mw.config.get( 'wgUserLanguage' ),
	'fallbackLanguages'
	) \|\| [];
	},

	/**
	* Get the language fallback chain for current UI language, including the language itself.
	*
	* @memberof mw.language
	* @return {string[]} List of language keys, e.g. `['pfl', de', 'en']`
	*/
	getFallbackLanguageChain: function () {
	return [ mw.config.get( 'wgUserLanguage' ) ]
	.concat( mw.language.getFallbackLanguages() );
	}

	} );

	}() );