I noted from a previous paper I worked on, that when it was published an abstract was included in Spanish as well as English (https://bjssjournals.onlinelibrary.wiley.com/doi/abs/10.1002/bjs.11422 and https://www.ncbi.nlm.nih.gov/pubmed/31976560). The article itself was in English.
I have had another article accepted with a different journal and publisher. I asked the editorial team if they would like abstract translations and they stated that they don't really publish abstract translations alongside the English abstract. I had the impression they had perhaps not thought of it before.
Is there benefit, such as for the article to be found in foreign language search results and potentially reach more readers, to providing translations of the abstract (even if the paper itself is in English)? I have lots of co-workers who are fluent in several languages and could provide abstracts in different languages fairly easily and for free.
If a publishing journal does not do this, is there benefit to putting up translated abstracts on ResearchGate or some other website with a link to the online version of the published article at the journal website?
EDIT 04/05/2020: I recently submitted a different article to different medical journal (a BMJ subsidiary journal) and they had a specific section in the submission process which was for uploading of foreign language abstracts. So I think it is something forward-thinking journals are starting to do but not all journals are doing it yet.