Pretty good translation. Only two hickups for me:

1. The context menu item is always present when right-clicking, regardless of any translation being available. If I click on an image, why is there the context menu entry with a single, deactivated item inside? If nothing is available, it should be entirely hidden, or at least configurable in the settings.

2. The window that opens seems to rarely not properly release all resources. Multiple translations in short succession occasionally break the windows (doesn't close, new ones open with a blank page or no more windows open)