Tweak response messages to /super_power and /registered_only

Fix translatability of "unknown command" server message

Make frontend translate server messages properly

Use plain text mode in video description label to avoid HTML trouble

Backed out changeset 076b7d23fab8. Well, the commit in question was needed after all ...

Fix critical failure to cleanup teams list after rejoining game after a force-quit. Fixes bug #597

Backed out changeset 6c0cf6b9eff8. Scripters should be prepared for nil and pretending the gear exists would cause more pain

Clean up more visual gears stuff in scripts - Make vgears non-critical if possible - Add nil checks where needed - Fix related bugs - Remove doomed attempts to call FollowGear on vgears

Clean up legacy visual gear stuff in ClimbHome, fix star despawn, make stars non-critical

Remove calls to GetVisualGearValues where it's not needed