Function getLocaleUserLanguage

scripts/storage.js:559–614

(userLanguage = false)

var languagesList = false, getLocaleUserLanguageCache = {};

function getLocaleUserLanguage(userLanguage = false)
{
	if(userLanguage === false)
		userLanguage = navigator.language || navigator.userLanguage;

	if(!userLanguage)
		return 'en';

	userLanguage = userLanguage.replace(/\_/g, '-').toLowerCase();

	if(getLocaleUserLanguageCache[userLanguage])
		return getLocaleUserLanguageCache[userLanguage];

	var _userLanguage = userLanguage;

	if(languagesList === false)
		languagesList = JSON.parse(readFileApp('/languages/languagesList.json'));

	var codes = [];

	for(let code in languagesList)
	{
		if(languagesList[code].active)
		{
			codes.push(code.replace(/\_/g, '-'));
		}
	}

	for(let i = 0, len = codes.length; i < len; i++)
	{
		if(codes[i] === userLanguage)
		{
			return getLocaleUserLanguageCache[_userLanguage] = codes[i];
		}
	}

	userLanguage = extract(/^([a-z]+)/iu, userLanguage, 1).toLowerCase();

	for(let i = 0, len = codes.length; i < len; i++)
	{
		if(codes[i] === userLanguage)
		{
			return getLocaleUserLanguageCache[_userLanguage] = codes[i];
		}
	}

	for(let i = 0, len = codes.length; i < len; i++)
	{
		if(extract(/^([a-z]+)/iu, codes[i], 1).toLowerCase() === userLanguage)
		{
			return getLocaleUserLanguageCache[_userLanguage] = codes[i];
		}
	}

	return getLocaleUserLanguageCache[_userLanguage] = 'en';
}

function parseDefaultObj(defaultObj)