3750 Filters and search should say CHOSE not CHOOSE regarding warnings

https://code.google.com/p/otwarchive/issues/detail?id=3750

Filters and work search said "Choose Not to Use Archive Warnings" when what we wanted was the warning_display_name, "Author Chose Not to Use Archive Warnings."

In related news, we should make that "Creator," not "Author."
Sure! But someone will have to walk me through it in very small words, since I can't figure out how to do it -- I just end up with an empty string for all the labels.