In the file
iw4x_00.iwd\ui_mp\settings_map.menu
MPUI_DESC_MAP_FIRINGRANGE not working
you just get DESCRIPTION NEEDED
at line
LOCAL_MAP_SELECTION(10, "mp_firingrange", "MPUI_FIRINGRANGE", "MPUI_DESC_MAP_FIRINGRANGE", "preview_mp_firingrange", dvarint("iw4x_maps_dlc") == 3)
Should show description in game as: Close range to medium range combat in a military practice facility in Cuba
As a workaround I have replaced "MPUI_DESC_MAP_FIRINGRANGE" with "Close range to medium range combat in a military practice facility in Cuba" in my Client file
see iw4x/iw4x-client#149 (comment)