Meh, if we had to choose between disabling MediaViewer and sometimes displaying usernames in the wrong gender, that would be a no-brainer. i18n is important, but not *that* important. (Also, the effect would not be that large - based on a quick grep, only about 12% of the existing MediaViewer localizations even use genders.)

I would prefer putting the genders directly into the imageinfo API, though. Ideally, any API that returns usernames should return genders as well, as they are necessary to display those usernames. Even more so if that API returns usernames from remote wikis whose API might not be public, or usernames from a ForeignDBRepo which might not even have a wiki associated...