UX feedback: I don't think asking users to choose a theme should be the first thing they see. Use the prefers-color-scheme CSS media feature by default. More fi

UX feedback: I don't think asking users to choose a theme should be the first thing they see. Use the prefers-color-scheme CSS media feature by default. More fine-grained control can be somewhere in advanced settings. Also, I think you're relying too heavily on AI translation. E.g. in the German interface, both "Intermediate" and "Advanced" translate as "Fortgeschritten", making the level-selection dropdown rather confusing. Your example texts have obvious translation mistakes. The phonetic hints are also completely off at least some of the time. And of course even if they were perfect, they don't help to distinguish phonemes that both map to the same representation in the target script. In its current state, I think anyone using your project to learn a language would be actively harmed by it.