Support language codes that are redirects

Addressing issue #207

Such language codes were not listed in ULS language list.

Root cause was $.uls.data.getLanguagesByScriptGroup was returning
a map of script groups, which contained only resolved language codes.
And later in append method of jquery.uls.lcd.js, there is a check if
that language code is part of languages list passed as option to uls()
call. This test fails and the language code does not get added to display.

Change-Id: Iec914a9694a46eef5750ef3af7346d66e052ab77

test/jquery.uls.test.js

@@ -227,8 +227,8 @@
 			'vro': 'Võro' // Target after alias
 		};
 		groupedLanguages = {
-			Latin: [ 'en', 'vro', 'sr-latn' ],
-			Cyrillic: [ 'ru', 'sr-cyrl' ]
+			Latin: [ 'en', 'fiu-vro', 'sr-latn', 'sr-el', 'vro' ],
+			Cyrillic: [ 'ru', 'sr', 'sr-cyrl' ]
 		};
 
 		assert.deepEqual( $.uls.data.getLanguagesByScriptGroup( languagesToGroup ), groupedLanguages,