Italian translation

Create it.po
French translation

Add fr.po
Update Makefile

Add fr + it to localization in Makefile
Fix .mo generation in Makefile
Add install to Makefile
Correct the code to open preferences
Bump to version 22
Add gnome 3.14
Make size of labels for unit fixed.

Basicly apply patches suggested by Philippe Troin.
Whenever the unit displayed changes (eg. B/s -> KB/s),
netspeed changes its total width and pushes back and forth the
other button at its left. This patch will fix the issue.