I used to be on a forum for engineers while I was in the middle east it was a local forum for the region It started out as most sites do English only. This was well and good for Persons who were native English speakers and quite well for persons from most of the European and Middle Eastern countries Since English in much of the world is considered the grounding language Mandarin being the second most grounding language in other parts of the world. However Arabic happened to the the principal native language of 70% of the users of the forum So the site managers decided to include or create an Arabic sub forum All was well and good for a while until conversations within a given topic started straying away from engineering. The site managers started having to constantly monitor every single post in every thread.
As one can imagine this shortly became very time consuming having to translate from one language to another than often times having to re translate it into 2 or 3 other languages then into English to determine the actual intended context of the posts. Eventually the site faded into oblivion. The ones who were serious about trying to help with questions soon became frustrated and simply stopped even trying to help the others. But a language like Arabic or say Mandarin for instance that do not use the the more world recolonized alpha numeric characters and symbols are difficult to interpret the poster's intent with the masculine and submissive undertones of the writings
Spanish has it's share of these as well but then again so does English for that manor depending on the region it is being spoken or written
I personally would welcome seeing a Spanish sub-forum even though I don't speak or read Spanish very well I have a few friends living in Brazil and we often converse in their native language which seams to be a Porugesee Spanish mix, but sometimes to understated them I have to translate to french or German then to Spanish and Porugesee then use a word here or there until when I translate my reply back into English it means very nearly what I wanted it to say before I sent it. It is a lot of trouble but at the same time worth it to be able to converse with someone I can no longer speak with in person since they do not speak or read English at all