This seems like there are new languages and package groups, but translations are not yet pushed into current Anaconda, so Alpha installation images are not fully translated even 100% in Transifex for a longer time.
Please verify that comps has latest strings in Transifex and then pull current comps state from Transifex into the current F16-Alpha repo and then into the current Anaconda buil process for Alpha-Beta-whatever.
Seems like similar problem in bz #730880.
This is likely just that there's no F16 alpha branch in transifex to match up with the F16 alpha branch in git, but it's too late to do anything about that now. When we start doing post-alpha builds, translations will get updated.