Well, I even tried to switch off Multisite installation of Buddypress and leave it in http://www.yucatanmercado.com but the problem still exist. Only one language can be displayed in English or Spanish.
Unfortunately, there is still the same problem.
All bilingual pages work only the Buddypress bilingual pages do not work.
Nothing helped even the new installation, different changing of permalinks.
It is strange because all work properly on a single page installation.
If anyone can help, it would be great…….