Add optional manual mode per translation and culture

I18N Commander/DataModel/Database/Common/DataContext.cs

@@ -58,6 +58,7 @@ public sealed class DataContext : DbContext, IDataContext
         modelBuilder.Entity<Translation>().HasIndex(n => n.Id);
         modelBuilder.Entity<Translation>().HasIndex(n => n.Culture);
         modelBuilder.Entity<Translation>().HasIndex(n => n.Text);
+        modelBuilder.Entity<Translation>().HasIndex(n => n.TranslateManual);
         modelBuilder.Entity<Translation>().Navigation(n => n.TextElement).AutoInclude();
 
         #endregion

I18N Commander/DataModel/Database/Translation.cs

@@ -9,4 +9,6 @@ public sealed class Translation
     public string Culture { get; set; } = "en-US";
 
     public string Text { get; set; } = string.Empty;
+
+    public bool TranslateManual { get; set; } = false;
 }