Hmmmm, curious. As for your first issue with the line-wrapping, I can see why that would cause problems. The mode for text-fields are currently set to "word (smart)", which does not appear to add a linebreak unless it meets a space, even if there is no spaces at all. There is no easy way to fix this quickly. I will look into making a solution for that in later versions, but that won't be anytime soon (as it is quite a bit of work).
As for your second problem, that one is quite strange. Lordling should support loading multiline string CSV just fine, and I don't see why Chinese characters would cause any issues (I wrote the file-reader myself, and while that definitely does not exclude it from being buggy, I don't see a reason why it should fail in this scenario). The other Chinese translations seem to load without issue (I just ran a test on those). Perhaps you can share your translation file on the Discord? If you do so, I can take a look what is making the loader fail.