api: do not display a warning by default when loading a script with a license different from GPL
irc: fix uncontrolled format string when sending ison command (for nicks monitored by /notify)
irc: fix uncontrolled format string when sending unknown irc commands (if option irc.network.send_unknown_commands is on)
relay: fix uncontrolled format string in redirection of irc commands
core: update italian translations