Windows installer improvements
Windows installer do need to remove previous Gajim installation. if you have 0.11.4 and you install 0.12 without removing 0.11.4, it makes gajim unusable. Old installer removed previous installation
Add a checkbutton to launch Gajim at the end of the installer.
Add a checkbutton to install a shortcut on the desktop
smaller prio: use separate files for translations