We have got in spain different languages, "Catalán", "Euskera", "Gallego", "Bable"..etc. This languages are speaking by some people from concrete zones of spain.
The official language of spain is the "Castellano". I think that there is no problem in speak this languages if somebody want. I think that this particular languages is a part of the spanish culture.
But I also think that it's a problem that the language become a problem to us. Languages was created for undestanding between us not for fight.
Nobody can prohibit to us speak "Euskera" or "Catalán" in Madrid or speak "Castellano" in "Bilbao" or "Barcelona".
Regards