Remove not useful comments

Change-Id: I99c30a6c6d6b59e86e5e3efe31f38439c5e95095

UniversalLanguageSelector.hooks.php

@@ -156,7 +156,7 @@ class UniversalLanguageSelectorHooks {
 	 * @return string
 	 */
 	protected static function getDefaultLanguage( array $preferred ) {
-		$supported = Language::fetchLanguageNames( null, 'mwfile' ); // since 1.20
+		$supported = Language::fetchLanguageNames( null, 'mwfile' );
 
 		// look for a language that is acceptable to the client
 		// and known to the wiki.

data/LanguageNameIndexer.php

@@ -31,7 +31,7 @@ class LanguageNameIndexer extends Maintenance {
 	}
 
 	public function execute() {
-		$languages = Language::fetchLanguageNames( null, 'all' ); // since 1.20
+		$languages = Language::fetchLanguageNames( null, 'all' );
 
 		$all = array();
 		$buckets = array();