ava: Generate Locale menu automatically (#4243)

Currently in `MenuMainBarView.axaml` we list all available languages and hardcode the language name with the language key.
It's a bit bad beause if we want to add a new language, we have to edit the `csproj` and the `axaml` with the translated language name and the language code.
I've put all translations in their respective locale files, add code into `MainMenuBarView` constructor to generate the menu automatically. Now we just have to edit the `csproj` if we want to add a new language.

Ryujinx.Common/Utilities/EmbeddedResources.cs

@@ -1,5 +1,6 @@
 using System;
 using System.IO;
+using System.Linq;
 using System.Reflection;
 using System.Threading.Tasks;
 
@@ -127,6 +128,13 @@ namespace Ryujinx.Common
             return stream;
         }
 
+        public static string[] GetAllAvailableResources(string path, string ext = "")
+        {
+            return ResolveManifestPath(path).Item1.GetManifestResourceNames()
+                .Where(r => r.EndsWith(ext))
+                .ToArray();
+        }
+
         private static (Assembly, string) ResolveManifestPath(string filename)
         {
             var segments = filename.Split('/', 2, StringSplitOptions.RemoveEmptyEntries);