al_set_menu_item_caption - Allegro 5 API

       Updates  the  menu  item  caption  with  the  new  caption.   This  will invalidate any previous calls to
       al_get_menu_item_caption(3alleg5).

       al_set_menu_item_caption - Allegro 5 API

al_get_menu_item_caption(3alleg5)

Allegro reference manual                                                       al_set_menu_item_caption(3alleg5)

       5.1.0

              #include <allegro5/allegro_native_dialog.h>

              void al_set_menu_item_caption(ALLEGRO_MENU *menu, int pos, const char *caption)