Hi, I study Japanese in Renshuu both in French and English. When I learn a new grammar point, the exemple sentences are either in English or French. The grammar point is written in green, both in the japanese and translated version. However, in the french version, a wrong part of the sentence is often in green. It don't really affect my understanding, but maybe it could be fixed in future updates :)
Ah, that is an excellent point. At the moment, there is not a way to mark this additional data for non-English languages. I'd like to know what you think, but whenever the language is not English, it might be better to simply suppress the green altogether (although leave it on the Japanese sentence).