Fixed the Right cell text in the Import/Export Accordion in Reports

Clicking on the Upload button causes the form to refresh and display the "Custom Reports" caption twice. This was fixed by setting the correct value in @right_cell_text
(This is yet another case of a non-AJAX Upload button, where the entire form refreshes after a file upload)

https://bugzilla.redhat.com/show_bug.cgi?id=1163661