Fix 0.4 compatibility (#16)

* added minetest 0.4 compatibility due the trasnlation missing support

* if translation is not supported use english on compat/mtg.lua
* improved the code of translation of the already init.lua
* this solves: closes https://github.com/minetest-mods/lavastuff/issues/13
* this solves: closes https://codeberg.org/minenux/lavastuff/issues/1
* close https://codeberg.org/minenux/lavastuff/issues/1

* real fix for compatibility later trasnlations

* real fix for https://github.com/minetest-mods/lavastuff/issues/13
* use native translator or intlib property as must be, but mock if both fails

* fix modname and use intlib depennds only in older engines

* autodetect mod name from minetest api
* added only intllib in depends.txt for older 0.4.X, mod.conf its for 5+
  so due 5+ has built in internationalization its not necesary in that file

* added the depends only when necesary for intllib

* Update init.lua usage or MODNAME and MODPATH

Co-authored-by: LoneWolfHT <lonewolf04361@gmail.com>

* puff also uage ot the MODNAME in get translator

* update luacheck as suggested by lonewolf

i dont know how to avoid the usage of those variables.. but he suggested to just put those .. https://github.com/minetest-mods/lavastuff/pull/16#issuecomment-1036497969

* move intllib to others to do not fail in checks agains moderns engine

also added ',' at the en of the line

Co-authored-by: LoneWolfHT <lonewolf04361@gmail.com>

.luacheckrc

@@ -23,7 +23,7 @@ read_globals = {
 	"nodecore",
 
 	-- Other mods
-	"stairsplus", "toolranks",
+	"stairsplus", "toolranks", "gettext", "intllib",
 }
 
 exclude_files = {

depends.txt

@@ -6,6 +6,7 @@ mobs_monster?
 3d_armor?
 toolranks?
 moreblocks?
+intllib?
 vessels?
 nc_fire?
 mcl_armor?

init.lua

@@ -1,15 +1,41 @@
 lavastuff = {}
 
-local MODPATH = minetest.get_modpath("lavastuff")
+local MODNAME = minetest.get_current_modname()
+local MODPATH = minetest.get_modpath(MODNAME)
 
 local COOLDOWN = dofile(MODPATH.."/cooldowns.lua")
 local S
 
 if minetest.get_translator ~= nil then
-	S = minetest.get_translator(minetest.get_current_modname())
+	S = minetest.get_translator(MODNAME)
 else
-	S = function(str)
+	if minetest.get_modpath("intllib") then
-		return(str)
+		dofile(minetest.get_modpath("intllib").."/init.lua")
+		if intllib.make_gettext_pair then
+			-- New method using gettext.
+			gettext, ngettext = intllib.make_gettext_pair()
+		else
+			-- Old method using text files.
+			gettext = intllib.Getter()
+		end
+		S = gettext
+	else
+		-- mock the translator function for MT 0.4
+		function minetest.translate(textdomain, str, ...)
+			local arg = {n=select('#', ...), ...}
+			return str:gsub("@(.)", function(matched)
+				local c = string.byte(matched)
+				if string.byte("1") <= c and c <= string.byte("9") then
+					return arg[c - string.byte("0")]
+				else
+					return matched
+				end
+			end)
+		end
+		function minetest.get_translator(textdomain)
+			return function(str, ...) return  minetest.translate(textdomain or "", str, ...) end
+		end
+		S = minetest.get_translator(MODNAME)
 	end
 end