Added an Auto fill transaltions help popover

Addresses this ticket: http://manage.dimagi.com/default.asp?115345#689444

I've added a question mark icon to the "Auto Fill translations" link on application language pages. The popover help text reads "This will pick the most common translations for your selected language.  You can then edit them as needed." as suggested in the FB ticket.
Yeah, I put that space in there to separate the text from the question mark icon. Now that you mention it though I agree that its sort of weird to have it there. I am about to commit a change where I have wrapped the `<a>` tag in a span with a space added there i.e. `<span> <a>...</a></span>`. Is there a preferred method?