If you are asking about SVC „Sonos Voice Control“…

SVC at the moment just supports French and English. 

Does Sonos support voice control to interact with Amazon Alexa and Google Assistant in Spanish (Spain)?

Sonos supports Alexa and on older devices Google Assistant. The supported language depends on Amazon and Google. 

Could you tell me if Sonos Roam2 has an integrated microphone that allows to have a conversation when you receive or make a phone call through your mobile phone via bluetooth?

Could you tell me if Sonos Roam2 has an integrated microphone that allows to have a conversation when you receive or make a phone call through your mobile phone via bluetooth?

It does not.