[Update] Plugins: Add localization system.

src-ui/plugins/dev_plugin_subtitles/locales/en.yml

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+main_page:
+    title: "VRCT Subtitles"

src-ui/plugins/dev_plugin_subtitles/locales/initI18n.js

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+import en from "./en.yml";
+import ja from "./ja.yml";
+import plugin_info from "../plugin_info.json";
+
+export const initI18n = (i18n) => {
+    const ns = plugin_info.plugin_id;
+    // parse once
+    const en_res = en;
+    const ja_res = ja;
+
+    // addResourceBundle will merge into i18n’s store
+    i18n.addResourceBundle("en", ns, en_res, /* deep = */ true, /* overwrite = */ true);
+    i18n.addResourceBundle("ja", ns, ja_res, /* deep = */ true, /* overwrite = */ true);
+};

src-ui/plugins/dev_plugin_subtitles/locales/ja.yml

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+main_page:
+    title: "字幕プレイヤー"

src-ui/plugins/dev_plugin_subtitles/locales/usePluginTranslation.jsx

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+import { useTranslation } from "react-i18next";
+import plugin_info from "../plugin_info.json";
+
+export const usePluginTranslation = () => {
+    const ns = plugin_info.plugin_id;
+    return useTranslation(ns);
+};