Fix Japanese locale so it actually shows.

Author: Hosch250

RetailCoder.VBE/UI/Settings/GeneralSettingsControl.cs

@@ -39,7 +39,7 @@ private void LoadLanguageList()
                 new DisplayLanguageSetting("fr-CA"),
                 new DisplayLanguageSetting("sv-SV"),
                 new DisplayLanguageSetting("de-DE"),
-                new DisplayLanguageSetting("jp-JP"),
+                new DisplayLanguageSetting("ja-JP"),
             };
 
             LanguageList.Items.AddRange(settings.Where(item => item.Exists).ToArray());