3x-ui/web/assets/js/langs.js

const supportLangs = [
	{
		name: "English",
		value: "en-US",
		icon: "🇺🇸",
	},
	{
		name: "فارسی",
		value: "fa-IR",
		icon: "🇮🇷",
	},
	{
		name: "简体中文",
		value: "zh-CN",
		icon: "🇨🇳",
	},
	{
		name: "繁體中文",
		value: "zh-TW",
		icon: "🇹🇼",
	},
	{
		name: "日本語",
		value: "ja-JP",
		icon: "🇯🇵",
	},
	{
		name: "Русский",
		value: "ru-RU",
		icon: "🇷🇺",
	},
	{
		name: "Tiếng Việt",
		value: "vi-VN",
		icon: "🇻🇳",
	},
	{
		name: "Español",
		value: "es-ES",
		icon: "🇪🇸",
	},
	{
		name: "Indonesian",
		value: "id-ID",
		icon: "🇮🇩",
	},
	{
		name: "Український",
		value: "uk-UA",
		icon: "🇺🇦",
	},
	{
		name: "Türkçe",
		value: "tr-TR",
		icon: "🇹🇷",
	},
	{
		name: "Português",
		value: "pt-BR",
		icon: "🇧🇷",
	},
];

function getLang() {
	let lang = getCookie("lang");

	if (!lang) {
		if (window.navigator) {
			lang = window.navigator.language || window.navigator.userLanguage;

			if (isSupportLang(lang)) {
				setCookie("lang", lang, 150);
			} else {
				setCookie("lang", "en-US", 150);
				window.location.reload();
			}
		} else {
			setCookie("lang", "en-US", 150);
			window.location.reload();
		}
	}

	return lang;
}

function setLang(lang) {
	if (!isSupportLang(lang)) {
		lang = "en-US";
	}

	setCookie("lang", lang, 150);
	window.location.reload();
}

function isSupportLang(lang) {
	for (l of supportLangs) {
		if (l.value === lang) {
			return true;
		}
	}

	return false;
}