start 3d stack for laser output

web/kiri/lang/en.js

@@ -692,6 +692,8 @@ self.kiri.lang['en-us'] = {
     ou_lays_l:      ["mark layers for stacking. the layer above will be output in a different color which the laser can mark with a lower power. turns on layer grouping."],
     ou_drkn_s:      "drag knife",
     ou_drkn_l:      ["enable drag knife","output in gcode","cut radii are added","to corners with","cut down passes"],
+    ou_stak_s:      "3D stack",
+    ou_stak_l:      ["output is a 3D stack of 2D paths rather than packing layers flat in 2D"],
 
     // OUTPUT FDM
     ou_nozl_s:      "nozzle temp",