info: revert back to reading GNOME version

In preparation for the next commit's backport.

[endlessm/eos-shell#2494]
info: Switch around GNOME and distro information

This makes the distribution logo prominent, and puts GNOME version
information in the small print.

https://bugzilla.gnome.org/show_bug.cgi?id=695691

[endlessm/eos-shell#2494]
Change "Input Sources" label

Use "Keyboard Layout" instead.

[endlessm/eos-shell#2290]
Merge pull request #5 from endlessm/shell/2290

Change "Input Sources" label
Merge pull request #4 from endlessm/shell/2494

Shell/2494