help messages from help-xonotic.cfg are initalized on client
When a client is started it executes help-xonotic.cfg
...
execing randomitems-xonotic.cfg
execing monsters.cfg
execing minigames.cfg
execing physics.cfg
execing help-xonotic.cfg
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
Warning: Could not expand $help_cfg_prefix
...