init static method
Initialize the languages.
Make sure to create an asset file named "(language)_(country).json" like "en_US.json" in your "assets/lang/" folder.
Implementation
static Future<void> init(List<String> langs) async {
languages.addAll(langs);
final String locale = Platform.localeName;
// can throw error (e.g. Unable to load asset: assets/lang/ja_JP.json)
final isSupported = await loadLanguage(locale);
if (!isSupported && locale != "en_US") await loadLanguage("en_US");
}