Instead of having a single translation using a
printf-formatted string, hardcode the 32- and
64-bit variants of the OS type to avoid any
translation problems.
https://bugzilla.gnome.org/show_bug.cgi?id=770593
Having the OS name and architecture at the same place proved
to be harder to understand than having the processor arch.
Fix that by splitting the OS name and type labels in different
rows.
https://bugzilla.gnome.org/show_bug.cgi?id=770593
Total disc size may be wrong if something like btrfs subvolumes are
used. Do not count multiple mounts with same device_path, because
it is probably something like btrfs subvolume. Use only the first one
in order to count the real size.
https://bugzilla.gnome.org/show_bug.cgi?id=708786
