MAVLinkInterface: null exception fix

CurrentState: handle more messages - many legacy
Locationwp: prevent exception
LogIndex: spin less

httpserver: secure http access/anti dos

httpserver: secure http access/anti dos

Import missing French localization resources (#3739)

* Initial plan

* Add French translation resource files

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Michael Oborne <mich146@hotmail.com>

MissionPlanner 1.3.83

Mission Planner 1.3.81

Mission Planner 1.3.80

MissionPlanner 1.3.79

MissionPlanner 1.3.78