DL refuses upload of Windows installer

[Sveinn í Felli <sv1 fellsnet is>]

When trying to submit gimp.po-windows-installer.master.is.po to the 
repository, I get this:

[An error occurred during applying your action: The commit failed. The 
error was: “[Errno 1] b"remote: translations user cannot modify 
'po-windows-installer/LINGUAS' \nTo ssh://git.gnome.org/git/gimp\n ! 
[remote rejected] master -> master (pre-receive hook declined)\nerror: 
failed to push some refs to 'ssh://git.gnome.org/git/gimp'\n"”]

Any idea what's going on?
Is Icelandic missing from the LINGUAS-file?

best regards,

Sveinn í Felli