Provide offline reading
I'm aware this would be incredibly difficult, but it'd be amazing if you ever produced an app or some way to access offline. I often want to use readlang on a plane or somewhere I can't get internet access.
Perhaps even just preprocessing the text and only allowing single word translation in offline mode?

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petr petrov commented
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Artur Zygmunt commented
Easier, but still reasonable solution would be a featre to remember words that I want to check the meaning of and create flashcards later (when in internet connection)...