Fix wrong language codes

Confused them with the flags from the web-side source used.

Tagalog (`tl`) still has no discernible effect, but that's because there
are actually no localisation files in `osu-resources` for that language.
Leave it be for now, as web has that entry, so it might mean that
translations might be coming at some point in the future.

osu.Game/Localisation/Language.cs

@@ -83,7 +83,7 @@ namespace osu.Game.Localisation
         sk,
 
         [Description(@"Svenska")]
-        se,
+        sv,
 
         [Description(@"ไทย")]
         th,
@@ -99,7 +99,7 @@ namespace osu.Game.Localisation
         // uk,
 
         [Description(@"Tiếng Việt")]
-        vn,
+        vi,
 
         [Description(@"简体中文")]
         zh,