Hi Mehdi, 

In first, my final aim is to find an answer on these questions:

Creating a Standard "SiteA" using Seblod Multisite feature, into the SiteA creation page I have to select the "Language" field. 

I noted it doesn't show the Language I have yet instaled in Joomla, so I think, that field it refers to the Seblod language files (I have not yet installed). My question are: 

• Is it right ?!?
  
• That field should not refer to the default language for SiteA (as for the MainSite into the Joomla Language Manager) ?
  

Then, if with "my final aim" you mean the languages I'm looking for, well, right now I'm looking for install Spanish and Italian.

Many Thanks for help