Collect ids of wrong translations and remove them

also restore correct translations if possible (if there is any translation with more than 0 vote then winner should be accepted).

Link to report containing ids of incorrect translations: https://docs.google.com/a/atlassian.com/spreadsheet/ccc?key=0ApPJQKzZa2Y_dDFsbEQ4RTdQdl9oYkd4WVlFZUJKelE

It needs to be fixed because of TRANS-554.

Make it a background job so it does not block UI and starts only once.