Added common language enum. Fixed "romaji" spelling. More UI updates.

MangaReader.Core/Metadata/SourceMangaLanguage.cs

@@ -1,9 +1,9 @@
 namespace MangaReader.Core.Metadata;
 
-public enum SourceMangaLanguage
-{
-    Unknown,
-    Japanese,
-    Romanji,
-    English
-}
+//public enum SourceMangaLanguage
+//{
+//    Unknown,
+//    Japanese,
+//    Romanji,
+//    English
+//}

MangaReader.Core/Metadata/SourceMangaTitle.cs

@@ -1,7 +1,9 @@
-namespace MangaReader.Core.Metadata;
+using MangaReader.Core.Common;
+
+namespace MangaReader.Core.Metadata;
 
 public class SourceMangaTitle
 {
     public required string Title { get; set; }
-    public SourceMangaLanguage Language { get; set; }
+    public Language Language { get; set; }
 }