Fix losing previous strings - Version 0.9.13

This bug was caused when going back to a previously translated string, completely changing it, and then pressing Next. The text would be lost due to some slightly obscure caching issue– which has been fixed!

As for new features, the menu on the translation activity has a new style, and added projects can specify a "project homepage" that you can open from within Stringlate (thanks @gsantner!). Remember that you can now find the Java API here.