fix(preferences): Fix language list sorting on preferences page

UI/MainUI/SOGoRootPage.m

@@ -659,15 +659,6 @@ static const NSString *kJwtKey = @"jwt";
   return [self labelForKey: [self language]];
 }
 
-NSComparisonResult languageSort(id el1, id el2, void *context)
-{
-    NSString *t1, *t2;
-
-    t1 = [context labelForKey: el1];
-    t2 = [context labelForKey: el2];
-
-    return [t1 compare: t2 options: NSCaseInsensitiveSearch];
-}
 
 - (NSArray *) languages
 {