Update error message

src/components/views/room_settings/ColorSettings.js

@@ -89,7 +89,7 @@ module.exports = React.createClass({
                     var NeedToRegisterDialog = sdk.getComponent("dialogs.NeedToRegisterDialog");
                     Modal.createDialog(NeedToRegisterDialog, {
                         title: "Please Register",
-                        description: "Guest users can't create new rooms. Please register to create room and start a chat."
+                        description: "Saving room color settings is only available to registered users"
                     });
                 }
             });

src/components/views/rooms/MemberInfo.js

@@ -170,11 +170,19 @@ module.exports = React.createClass({
                 // get out of sync if we force setState here!
                 console.log("Mod toggle success");
             }, function(err) {
+                if (err.errcode == 'M_GUEST_ACCESS_FORBIDDEN') {
+                    var NeedToRegisterDialog = sdk.getComponent("dialogs.NeedToRegisterDialog");
+                    Modal.createDialog(NeedToRegisterDialog, {
+                        title: "Please Register",
+                        description: "This action cannot be performed by a guest user. Please register to be able to do this."
+                    });
+                } else {
                     Modal.createDialog(ErrorDialog, {
                         title: "Mod error",
                         description: err.message
                     });
                 }
+            }
         );
         this.props.onFinished();        
     },