Don't send back URLs in survey questions

As discussed in Issue #28, we were sending back URLs in the survey question text. This removes URLs from survey questions by allowing you to set a nickname (short name) for each question. The short name is sent back instead of the actual question text, if the question text has a URL.
I filed crbug.com/441421. I still can't tell whether it's a problem with document, implementation, or developer (me).