Following tracker: [#31438] News Feed Manager: News Feed Page-> Sorting is not working.

Steps to reproduce -
1.Go to News Feed Manager: News Feed Page.
2.In Created by --> click on "Select User" button. It will open modal window.
3.Click on Headers for sorting.
4.Verify the result in firebug

Expected result - 
System should do the sorting for columns.

Actual Result - 
Firebug throws the error for following -
1. When system open the modal window
2. After clicking on the headers for sorting & also system does not do the sorting.
Fire bug errors - 
when open modal window - "Error: TypeError: Joomla.tableOrdering is not a function"
after clicking headers - "Error: TypeError: Joomla.JText._ is not a function"