Submissions shouldn't require titles
When submitting an image, it's currently necessary to fill in the
title field or the user will get a "Field must be between 1 and 500
characters long." notice.
However, a title should not be required when submitting. For
instance, when submitting a large amount of images the user might
not want to think of and type in titles for every single one. We
should leave it up to the user to determine whether titles are
needed or not, instead of blocking the submission process.