Missing error message - dictionary

When looking up words in the new editor's dictionary you also need to keep in mind to enter a target language when you search. If you forget it you only get an "unknown error" message instead of a message like "please select a target language", which would be very helpful.

1. Missing target language

2. Unknown error

3. Select language

4. Everything works fine, all's good now. But an error message stating the error would have been nice.