Perfect Sebastian !!!

Then, I have to choose system for what I want to do. Thanks a lot,

DV FX

Yes, excepted that you will only affect one portal if you use the command under 'Admin' menu (you can be logged in as Super User or Admin, what is important is the way you access the language editor, not the user logged in). Sebastian and others will correct me if I am wrong.
If you want to modify it for all portals, do it under 'host menu'. But beware, if you use the language editor in "host" or "admin" mode, you get customizations that do not get overwritten on installations of the module or any language pack (for me it is problematic, but maybe this is what you are searching for).

DV FX

Another solution, for example if you want to use the FAQ module more than once on the site, make a special container with the content having a unique id and then add the following CSS to your skin...

#MyUniqueContainerID span.SubHead {display:none;}

This allows you to selectively turn Q/A on and off meaning that if you want them off on one page and on on another you can!