add translation support

depends.txt

@@ -1,3 +0,0 @@
-default
-vessels
-flowers

init.lua

@@ -4,6 +4,20 @@ invisibility = {}
 local effect_time = 180 -- 3 minutes
 
 
+-- translation support
+local S
+if minetest.get_translator then
+	S = minetest.get_translator("invisibility") -- 5.x translation function
+else -- boilerplate function
+	S = function(str, ...)
+		local args = {...}
+		return str:gsub("@%d+", function(match)
+			return args[tonumber(match:sub(2))]
+		end)
+	end
+end
+
+
 -- reset player invisibility if they go offline
 minetest.register_on_leaveplayer(function(player)
 
@@ -17,14 +31,14 @@ end)
 
 -- creative check
 local creative_mode_cache = minetest.settings:get_bool("creative_mode")
-function is_creative(name)
+local function is_creative(name)
 	return creative_mode_cache or minetest.check_player_privs(name, {creative = true})
 end
 
 
 -- invisibility potion
 minetest.register_node("invisibility:potion", {
-	description = "Invisibility Potion",
+	description = S("Invisibility Potion"),
 	drawtype = "plantlike",
 	tiles = {"invisibility_potion.png"},
 	inventory_image = "invisibility_potion.png",
@@ -47,7 +61,7 @@ minetest.register_node("invisibility:potion", {
 		-- are we already invisible?
 		if invisibility[name] then
 
-			minetest.chat_send_player(name, ">>> You are already invisible!")
+			minetest.chat_send_player(name, S(">>> You are already invisible!"))
 
 			return itemstack
 		end
@@ -67,7 +81,7 @@ minetest.register_node("invisibility:potion", {
 			and user:get_pos() then
 
 				minetest.chat_send_player(name,
-					">>> You have 10 seconds before invisibility wears off!")
+					S(">>> You have 10 seconds before invisibility wears off!"))
 			end
 		end)