Standardize column names on Test Run

When at the Test Run window, on Total Test section, the name of the column and the filter field should be equal to the one when adding one more column. 
Example: when adding one more column called "TestRun Assignee", then the column name is just assignee as well as for the filter field. It may causes confusion.

And if the column was called "TestRun assignee" instead just "assignee" there would me more explicit to what type of assignee is it relate.