Fix usage of console causing errors on browsers not having it

https://translatewiki.net/wiki/Thread:Support/Loss_of_script_functionality

Change-Id: Iace2ba107221673514942331d0e43559ff6b4c19

resources/ext.uls.core.js

@@ -8,7 +8,7 @@
 		this.languages = this.$menu.data( 'languages' );
 		for ( var code in this.languages ) {
 			if ( $.uls.data.languages[code] === undefined ) {
-				console && console.log && console.log( "ULS: Unknown language " + code + "." );
+				window.console && console.log && console.log( "ULS: Unknown language " + code + "." );
 				delete this.languages[code];
 			}
 		}