feat(i18n): add ui localization (#2279)

Co-authored-by: TheElixZammuto <6505622+TheElixZammuto@users.noreply.github.com>

src_assets/common/assets/web/locale.js

@@ -0,0 +1,27 @@
+import {createI18n} from "vue-i18n";
+
+// Import only the fallback language files
+import en from './public/assets/locale/en.json'
+
+export default async function() {
+    let r = await (await fetch("/api/configLocale")).json();
+    let locale = r.locale ?? "en";
+    document.querySelector('html').setAttribute('lang', locale);
+    let messages = {
+        en
+    };
+    try {
+        if (locale !== 'en') {
+            let r = await (await fetch(`/assets/locale/${locale}.json`)).json();
+            messages[locale] = r;
+        }
+    } catch (e) {
+        console.error("Failed to download translations", e);
+    }
+    const i18n = createI18n({
+        locale: locale, // set locale
+        fallbackLocale: 'en', // set fallback locale
+        messages: messages
+    })
+    return i18n;
+}