Same situation here :
I have tried the following actions, also didn’t work :
1. Clear all cache – didn’t work
2. Edit Directly in the .po file – didn’t work
3. Delete the whole .po file – didn’t work (translated string don’t return to original language)
4. Remove the plugin and reinstall – didn’t work
5. Remove plugin and clear database – didn’t work
Can anyone help to solve this problem? It is really annoying as the translated string cannot be editted