UI: #334 add config page language setting (#374)

* UI: #334 add config page language setting

* temporary remove logout button

* Unify fullscreen view class for dialog expanded and settings view

- Replace dialog-expanded and settings-view with single fullscreen-view class
- Update ResponsiveDialog to use fullscreen-view class
- Update CalendarLayout to use fullscreen-view class for settings view
- Consolidate CSS rules in Menubar.styl to use fullscreen-view
- Update test cases to use new class name

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Co-authored-by: Lê Nhân Phụng <lenhanphung@Phung-Mac-M4.local>

src/features/Settings/constants.ts

@@ -0,0 +1,6 @@
+export const AVAILABLE_LANGUAGES = [
+  { code: "en", label: "English" },
+  { code: "fr", label: "Français" },
+  { code: "ru", label: "Русский" },
+  { code: "vi", label: "Tiếng Việt" },
+] as const;