Sort languages by script in the initial view

* Added new utility functions to return all languages by script group.
* Used that function to sort languages initially.
* Added tests.

Change-Id: I405cb73e6af13f59c307da5a7f2269049ecba698

resources/ext.uls.data.utils.js

@@ -32,6 +32,20 @@
 		return $.uls.data.autonyms[language];
 	};
 
+	/**
+	 * Returns an array of all region codes.
+	 * @return array
+	 */
+	$.uls.data.allRegions = function() {
+		var allRegions = [];
+
+		for( var region in $.uls.data.regiongroups ) {
+			allRegions.push( region );
+		}
+
+		return allRegions;
+	};
+
 	/**
 	 * Returns all languages written in script.
 	 * @param script string
@@ -131,6 +145,15 @@
 		return $.uls.data.languagesByScriptGroupInRegions( [ region ] );
 	};
 
+	/**
+	 * Returns an associative array of all languages,
+	 * grouped by script group.
+	 * @return associative array
+	 */
+	$.uls.data.allLanguagesByScriptGroup = function() {
+		return $.uls.data.languagesByScriptGroupInRegions( $.uls.data.allRegions() );
+	};
+
 	/**
 	 * Returns an associative array of languages in several regions,
 	 * grouped by script group.