Freeze Break Request: Session Menu Heading

[Allan Day <allanpday gmail com>]

Hi everyone,

We've got a small cosmetic change that we'd like to make. The session
menu in the login screen was changed in 3.10. Unfortunately, the
"Session" heading lost its styling, so it looks like a regular menu
item.

The change simply involves making "Session" bold. Here's a screenshot
from the bug [1]:

https://bug707072.bugzilla-attachments.gnome.org/attachment.cgi?id=253544

Thanks,

Allan

[1] https://bugzilla.gnome.org/show_bug.cgi?id=707072