feat: install and configure i18n features (#177)

Co-authored-by: Shinigami <chrissi92@hotmail.de>
Co-authored-by: 三咲智子 Kevin Deng <sxzz@sxzz.moe>
Co-authored-by: Daniel Roe <daniel@roe.dev>

plugins/i18n.ts

@@ -0,0 +1,25 @@
+import { createI18n } from 'vue-i18n'
+import enUS from '../locales/en-US.json'
+import zhCn from '../locales/zh-CN.json'
+
+/** Default language environment */
+export const defaultLocale = 'en-US'
+
+export const messages = {
+  'en-US': enUS,
+  'zh-CN': zhCn,
+}
+
+/** Language Environment List */
+export const localeList = Object.keys(messages)
+
+export default defineNuxtPlugin(({ vueApp }) => {
+  const i18n = createI18n({
+    legacy: false,
+    globalInjection: true,
+    locale: defaultLocale,
+    messages,
+  })
+
+  vueApp.use(i18n)
+})