Hi Hopkins,
Thank you for writing the plugin! I found the recommendation in a Chinese tutorial.
However, there was a little problem that I couldn't figure out.(((゚д゚)))
When I clicked the button, the "Chinese Conversation window" popped out successfully, but it was too long to show the whole of it.
No matter how hard I tried to drag it to somewhere or shrink it smaller, the window stayed firmly where it was. All I could do was close it.
Until now, the "OK button" and "Source(來源) column" have still played hide-and-seek with me...
I am a Traditional Chinese user so my reply may be too messy to read.
Here is the image shows the naughty window↓
And my information just in case:
Windows 7
Screen resolution:1366X768
Calibre 3.12
Traditional<->Simplified Chinese Convertor 2.30

Thanks for your work again! The plugin has helped lots of users!