[July 4, 2013] Since the last upgrade, team owners and admins have the capacity to delete whole sets of subtitles, also made by others, via a Delete Subtitle Language button.
This button is dangerously placed where the Edit button normally is.
True, clicking that button opens a page of explanation, but it is only in English, because
of Amara Website updates [has been] put on hold since at least
January 18, 2013 (see the attached PDF, where I copied and annotated 2 samples of this page: one for translated subs, one for subtitles used by others to create translated subs): it's the same language issue that lead so many people to sync their YouTube channel and Amara subtitles without understanding the implications, because they were only explained in English.
Moreover, contrary to the make-believe and mostly not working trick added by Amara on April 1st, 2013, to the first post of Removing subtitles or videos, it really does delete [update, July 6: not quite, apparently - I'll try to explain in a comment] the set of subtitles the button is on AND, if requested, subtitles translated from it. See the Activity page for "Long blank video (1:46:39)" (1): it still lists:
(1) An empty video I made to try Amara things, where I am the only subtitler. I added it to the Captions Requested team in order to try this Delete Subtitle Language function.
These oddities seem to indicate that the Delete Subtitle Language function does not really completely delete subtitles but that a copy is kept on the Amara server, which partly and messily acts upon new subtitles that get restarted after the "deletion" of the former ones.
This messiness is one more reason why Amara staff should withdraw this function and rework it before offering it again. But the main point is that it should only be offered to subtitle authors, and NOT to team owners / admins unless when they are authors themselves.