feat: add i18n in login page (#5947)

* feat: add i18n in login page

* fix: add word space and put the app name into the title

* fix: remove duplicate replace title

* fix: prettier format code

* fix: fix typescript check warning

* fix: add zh-cn locale file code owner

* fix: use existing flag locale to the login page

Co-authored-by: Joe Previte <jjprevite@gmail.com>

src/node/cli.ts

@@ -180,7 +180,14 @@ export const options: Options<Required<UserProvidedArgs>> = {
   enable: { type: "string[]" },
   help: { type: "boolean", short: "h", description: "Show this output." },
   json: { type: "boolean" },
-  locale: { type: "string" }, // The preferred way to set the locale is via the UI.
+  locale: {
+    // The preferred way to set the locale is via the UI.
+    type: "string",
+    description: `
+      Set vscode display language and language to show on the login page, more info see 
+      https://en.wikipedia.org/wiki/IETF_language_tag
+    `,
+  },
   open: { type: "boolean", description: "Open in browser on startup. Does not work remotely." },
 
   "bind-addr": {