I am administrator of several Facebook pages. For example, I have a page made for Germany and other German-speaking countries: Austria, Switzerland, Liechtenstein and Luxembourg. So the main language should be German to get maximum possible reach.
Recently I discovered a multilingual function, and since then I have been writing posts not only in German but also in other languages which I know: English and Russian. But sadly, the option is not available for posts which were initially sent on one language. So if I post something in at least two languages, I can come later and add as many other languages as I wish. But if the post is written only on one language, there is no way to add second, third, languages anymore - for this specific post.
The same issue doesn't occur on Wall or Groups. There a post written on one language can be improved by adding translation any time. So the theory that they don't want ability to add more languages to old posts doesn't hold water. Another argument against this theory is that they allow adding any number of languages to same post if it was initially written on two or more languages; only monolingual posts are doomed to stay monolingual.
I sent Facebook feedback which says much of what is above, and got a generic response.
Is there any workaround which could work even now in the meantime?
I tried https://m.facebook.com/ and official Android App "Facebook Pages" - and they are even worse because they don't properly support Multilingual Posts at all. Now I could also try Facebook App for Android - but I doubt it will be better since it's very similar to the Facebook Mobile site in my experience.