ok, I did some more investigations.
First, of course there is some svg stuff inside, this is the code for “?”… how stupid I am.
That was just meaning it did not find fa-twitter for example.
I decided then to remove social-media-links as clean-blog theme already got some lines for it. Same behavior.
So, I also removed “embed font awesome” plugin. And… miracle 
I finally got icons !
so strange…
I actually have no time to dig further and understand why, it’s working and it’s ok for me. But one day, I will search and understand why 
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