[Bug 1021565]: The 'Settings' link is now only visible to non-Mozillians in Mobile view.

This commit aims to fix Bug 1021565. The 'Settings' link is now only visible to non-Mozillians in the Mobile view (earlier it was visible to all groups). 
I might have confused you with my previous comment. The settings link should be visible for all non mozillians. You can follow the same logic with this commit: d3a7fbd4a99d4974968ff79642fb1450bc4a1b75