add
gimp-justify-block
gimp-justify-center
gimp-justify-left
gimp-justify-right
patch
gimpicons.c
gimpicons.h
to get active and replace gtk-justify-*
'gimp/app/tools/gimptextoptions.c: box = gimp_prop_enum_icon_box_new (config, "justify", "gtk-justify", 0, 0);
must be patched