[all] function to check 'isRtl' flag

apps/common/locale.js

@@ -167,10 +167,15 @@ Common.Locale = new(function() {
         } else require(polyfills, _requireLang);
     } else _requireLang();
 
+    const _isCurrentRtl = function () {
+        return false;
+    };
+
     return {
         apply: _applyLocalization,
         get: _get,
-        getCurrentLanguage: _getCurrentLanguage
+        getCurrentLanguage: _getCurrentLanguage,
+        isCurrentLanguageRtl: _isCurrentRtl
     };
     
 })();

apps/common/main/lib/util/utils.js

@@ -1092,3 +1092,12 @@ Common.Utils.getKeyByValue = function(obj, value) {
         }
     }
 };
+
+Common.UI.isRTL = function () {
+    if ( window.isrtl == undefined ) {
+        window.isrtl = Common.localStorage.itemExists('ui-rtl') ?
+                            Common.localStorage.getBool("ui-rtl") : Common.Locale.isCurrentLanguageRtl();
+    }
+
+    return window.isrtl;
+};