complete french translation

[lorien420] if dbus is there, but notif-daemon is not running, use old style notifications. (I cannot test this as release of notif-daemon is not being listed even if it running). Lorie said devel is ok

of only when a tab is individually closed.

history window now has a calendar; tons of cleanups, comments, better varnames and in general better quality of code; also a fixme for another day