Thanks for your help.
In every Template using
{vb:raw project.title_clean}
E.g.:
http://projectbay.net/forum/project.php?issueid=1
The Icon included in the project title shows correctly in the navbar (I changed the php to us 'title' instead of 'title_clean')
But on the right you see "Project vBExperience<a class="main4" title="Forum" href="forumdisplay.php?81-vBExperience"></a>"
I want to split off the part after < which is simple in php ... if you know where to add the code...
Edit: My suggestion for 2.2 is, to give an extra input field "name html" in the Project properties as known in the thread prefixes.