feat: i18n, page title

(cherry picked from commit 0d9fc72bee009c591400055725680a6a0f5a9c83)

src/i18n/translation.ts

@@ -0,0 +1,30 @@
+import {en} from "./languages/en.ts";
+import {zh_TW} from "./languages/zh_TW.ts";
+import {zh_CN} from "./languages/zh_CN.ts";
+import type I18nKey from "./i18nKey.ts";
+import {getConfig} from "../utils/config-utils.ts";
+
+export type Translation = {
+    [K in I18nKey]: string;
+}
+
+const defaultTranslation = en;
+
+const map: { [key: string]: Translation } = {
+    "en": en,
+    "en_us": en,
+    "en_gb": en,
+    "en_au": en,
+    "zh_cn": zh_CN,
+    "zh_tw": zh_TW,
+}
+
+export function getTranslation(lang: string): Translation {
+    lang = lang.toLowerCase();
+    return map[lang] || defaultTranslation;
+}
+
+export function i18n(key: I18nKey): string {
+    const lang = getConfig().lang || "en";
+    return getTranslation(lang)[key];
+}