add nozzle selector for supports. move list consts to api

web/kiri/lang/en.js

@@ -207,6 +207,8 @@ kiri.lang['en-us'] = {
     sp_area_l:      "minimum area for\na support column\nin millimeters",
     sp_xpnd_s:      "expand",
     sp_xpnd_l:      "expand support area\nbeyond part boundary\nin millimeters",
+    sp_nozl_s:      "extruder",
+    sp_nozl_l:      "in multi-extruder systems\nthe extruder to use for\nsupport material",
 
     // LASER SLICING
     ls_offs_s:      "offset",

web/kiri/style.css

@@ -735,7 +735,7 @@ button[import="1"] {
     justify-content: center;
     align-items: center;
     position: fixed;
-    bottom: 40px;
+    top: 40px;
     left: 0;
     right: 0;
 }