Rated 5 out of 5 stars

Great job! But could you add Russian? I can help u

This review is for a previous version of the add-on (1.0.2). 

Hi! Thank you for your feeback. The extension is right now under development for internationalization. You can have a look at it in the github repository - https://github.com/jydidier/icanban-thunderbird - and maybe check the russian translations made in GPT style (so probably not accurate enough).