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

Это отзыв для предыдущей версии этого дополнения (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).