@BeAware I'm neither a power user nor a UX expert, but usually I am better than average at doing stuff with UIs. The fact that I failed to intuitively do it well, and failed to figure out it was a thing after more than a year, is an illustration of an opportunity (and my imperfections too of course).
It may be solved through marketing via #fediTips , or through automatic language detection, or something else I didn't think of. The button color seems perfectly fine to me..