Transifex migration

This PR adds the needed config files (well, one is just an example since it doesn't have actual username/password), updates all of the translations, then merges the results of `tx pull` into the mainline. The main impact this has is that information about "fuzzy" translations are now stored in transifex, and the original values were cleared. This will result in the same behavior to the user, but in case this causes any unexpected issues I committed the updated translations before the `tx pull` to have that history.