Below is a list of all acceptable Locales:
{
"af-ZA": [
"Afrikaans",
"Afrikaans"
],
"ar": [
"العربية",
"Arabic"
],
"bg-BG": [
"Български",
"Bulgarian"
],
"ca-AD": [
"Català",
"Catalan"
],
"cs-CZ": [
"Čeština",
"Czech"
],
"cy-GB": [
"Cymraeg",
"Welsh"
],
"da-DK": [
"Dansk",
"Danish"
],
"de-AT": [
"Deutsch (Österreich)",
"German (Austria)"
],
"de-CH": [
"Deutsch (Schweiz)",
"German (Switzerland)"
],
"de-DE": [
"Deutsch (Deutschland)",
"German (Germany)"
],
"el-GR": [
"Ελληνικά",
"Greek"
],
"en-GB": [
"English (UK)",
"English (UK)"
],
"en-US": [
"English (US)",
"English (US)"
],
"es-CL": [
"Español (Chile)",
"Spanish (Chile)"
],
"es-ES": [
"Español (España)",
"Spanish (Spain)"
],
"es-MX": [
"Español (México)",
"Spanish (Mexico)"
],
"et-EE": [
"Eesti",
"Estonian"
],
"eu": [
"Euskara",
"Basque"
],
"fa-IR": [
"فارسی",
"Persian"
],
"fi-FI": [
"Suomi",
"Finnish"
],
"fr-CA": [
"Français (Canada)",
"French (Canada)"
],
"fr-FR": [
"Français (France)",
"French (France)"
],
"he-IL": [
"עברית",
"Hebrew"
],
"hr-HR": [
"Hrvatski",
"Croatian"
],
"hu-HU": [
"Magyar",
"Hungarian"
],
"id-ID": [
"Bahasa Indonesia",
"Indonesian"
],
"is-IS": [
"Íslenska",
"Icelandic"
],
"it-IT": [
"Italiano",
"Italian"
],
"ja-JP": [
"日本語",
"Japanese"
],
"km-KH": [
"ភាសាខ្មែរ",
"Khmer"
],
"ko-KR": [
"한국어",
"Korean"
],
"lt-LT": [
"Lietuvių",
"Lithuanian"
],
"lv-LV": [
"Latviešu",
"Latvian"
],
"mn-MN": [
"Монгол",
"Mongolian"
],
"nb-NO": [
"Norsk bokmål",
"Norwegian (Bokmål)"
],
"nl-NL": [
"Nederlands",
"Dutch"
],
"nn-NO": [
"Norsk nynorsk",
"Norwegian (Nynorsk)"
],
"pl-PL": [
"Polski",
"Polish"
],
"pt-BR": [
"Português (Brasil)",
"Portuguese (Brazil)"
],
"pt-PT": [
"Português (Portugal)",
"Portuguese (Portugal)"
],
"ro-RO": [
"Română",
"Romanian"
],
"ru-RU": [
"Русский",
"Russian"
],
"sk-SK": [
"Slovenčina",
"Slovak"
],
"sl-SI": [
"Slovenščina",
"Slovenian"
],
"sr-RS": [
"Српски / Srpski",
"Serbian"
],
"sv-SE": [
"Svenska",
"Swedish"
],
"th-TH": [
"ไทย",
"Thai"
],
"tr-TR": [
"Türkçe",
"Turkish"
],
"uk-UA": [
"Українська",
"Ukrainian"
],
"vi-VN": [
"Tiếng Việt",
"Vietnamese"
],
"zh-CN": [
"中文 (中国大陆)",
"Chinese (PRC)"
],
"zh-TW": [
"中文 (台灣)",
"Chinese (Taiwan)"
]
}