Feature/copy onepercent tickets

This PR contains an abundance of language fixes. There is a corresponding PR in Bluebottle on which this PR depends. In addtion to the language fixes, there are also three migrations to deal with the time_available property change on the base user (and thus Member) model.

The resolved tickets are: 914, 913, 812, 814, 813, 816, 815, and 817.