Improve Session Restart Required info message
Improve Session Restart Required info message

Implementation of agreed change at https://github.com/lxde/lxqt/issues/852.
Closes lxde/lxqt#852.

lxde/lxqt-session,lxde/lxqt-session,stefonarch/lxqt-session,stefonarch/lxqt-session,rbazaud/lxqt-session,smart2128/lxqt-session,jeremywh7/lxqt-session,ThomasVie/lxqt-session,lxde/lxqt-session,smart2128/lxqt-session,stefonarch/lxqt-session,jeremywh7/lxqt-session,rbazaud/lxqt-session,ThomasVie/lxqt-session