Oh great timing! I was just starting to play with building a toy project (https://github.com/bpevs/multireader) for practicing Spanish while reading books with my e-reader, but frankly, I'm just building it because I haven't found an app that works for me, and I'd rather spend time actually actually learning language...

Just playing with your app for a bit, and it's pretty cool! had a few questions though:

1. Wondering about the decision of using English books and translating pieces into other languages vs starting with (for example) a Spanish book, and translating the other way? Also, would something like this be a future thought of plan? Because currently I'm trying to read more popular books in my target language, rather than English books (right now, my toy app is just highlight arbitrary text -> send to azure translate). I tried to upload my book into your app in Spanish, but I guess it only works rn if the source is in English? Basically, a mode for even more immersion would be killer (Ala either full-target-languge mode or upload target language books).

2. The practice mode is pretty cool! I like this format of "complete the sentence". It looks like it's not based on book content at all, right? Would be cool to practice based on what I'm reading.

3. I'm reading on an e-reader, so I'd reeeeally like a no-animation/no-scroll mode. On an e-reader, the paginated page refreshing can help to reduce ghosting. Even better if there could be an e-reader mode that can flash the screen to further reduce ghosting issues on those devices.