To change the interface language, use the menu : Options > Languages and choose from the list.
If you chose a language in which you no longer know how to use the interface at all (including changing language back), use the Undo keyboard shortcut CTRL+Z to undo your change.
The following translations are available in version 0.8.15:
English, French, Dutch, Finnish, German, Greek, Italian, Lithuanian, Norwegian, Polish, Portuguese, Romanian, Spanish, Turkish, Chinese and Swedish.
See also :