Description:
Add opportunity to create a custom name for field in the Pivot table

Steps to Reproduce:
1. Create a Pivot table from some source table
2. Open Pivot table's properties dialog
3. Double click on any field => It will open a Data field dialog
4. In the dialog you'll see Name: of the field. That name is a title of column from the source table.
5. And you can't change it to your own custom name in the Pivot table

Actual Results:
you can't change field name to your own custom name in the Pivot table

Expected Results:
you can change field name to your own custom name in the Pivot table


Reproducible: Always


User Profile Reset: No



Additional Info:
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