Change label for computer:// from "Computer" to "Devices".

The "Computer" may be sometimes confusing because it does not reflect
contents of that folder. Despite the "Computer" (or "My Computer") is
already used by Windows the name "Devices" is more obvious.
Show "Home Folder" in Places instead of user login name.

The user's login name is not so obvious for inexperienced user.

Thanks for hint to Stephan Sokolow <gmane.ssokolow@spamgourmet.com>
Place "Filesystem Root" after "Trash Can", "Devices" after "Applications".

That order is more convenient.
Thanks for explanations to Stephan Sokolow <gmane.ssokolow@spamgourmet.com>
Use "Filesystem Root" instead of "File system".

According to Stephan Sokolow <gmane.ssokolow@spamgourmet.com>:

Include the word "Root" because, on its own, the concept of "Filesystem"
doesn't carry a strong enough sense of location.
Apply common human interface guidelines to capitalization of strings.

The GNOME HIG: https://developer.gnome.org/hig-book/unstable/design-text-labels.html.en#layout-capitalization
The KDE HIG: http://techbase.kde.org/Projects/Usability/HIG/Capitalization
[l10n] Update POT file.