Hi Marco,
Sorry for delayed response.
Did you check language support ?
Languages Support - CA Client Automation - 14.0 - CA Technologies Documentation
Spanish OS is not certified, so English OS is ok. And, Manager component is not localized to Spanish, so you can use English/French/German/Japanese only in DSM Explorer.
On the other hand, Agent component is localized to Spanish.
I tried to switch to Spanish using ccnfcmda command on Agent. I don't understand Spanish, but I believe it.
Note: my box is Japanese Windows.
Regards
Yas