Doesnt this related to this request?
I’d suggest you writting someone from Crowdin team or raise this as a feature request Feature requests and ideas | Crowdin
Don’t think someone from community have an access to Crowdin database and can modify duplicates rules. I also think that Welsh is quite popular and this thing was definetelly reported in past, but as it is kept until today, then there is a reason for this. Probably not to break any import of export or so.