Add feedback indicating an upgrade vs craft

table.lua

@@ -409,6 +409,7 @@ end
 -- Returns a formspec string
 function fs.craft(x, y, pos, rank, meta, skin)
     local cost, is_positive = get_craft_material_cost(meta);
+    local stack = meta:get_inventory():get_stack("output", 1);
 
     local data = {
         x = x,
@@ -432,7 +433,7 @@ function fs.craft(x, y, pos, rank, meta, skin)
             h = 0.5,
 
             id = "craft",
-            text = "Craft Map",
+            text = stack:get_name() == "cartographer:map" and "Upgrade Map" or "Craft Map",
             disabled = not (is_positive and can_afford(cost, meta)),
         },
         fs.cost(1.25, 1.375, cost, skin),