isValidLocale static method
Validates if a locale string is valid
Returns true if the locale is supported, false otherwise
Implementation
static bool isValidLocale(String locale) {
const validLocales = [
'en_US',
'en_GB',
'es_ES',
'fr_FR',
'de_DE',
'ar_SA',
'ja_JP',
'zh_CN',
'en',
'es',
'fr',
'de',
'ar',
'ja',
'zh',
];
return validLocales.contains(locale);
}