Currently on the system status page the the memory usage is shown in kB
only. If you have a system with 1 GB of Ram its hard to read the large
numbers. This automatically formats the byte numbers more human readable
into KB / MB / GB.
Submitted-by: Claudio Marelli <camarelli@gmx.net>
[squash commits, rewrap commit message]
Signed-off-by: Jo-Philipp Wich <jo@mein.io>