luaengine: translation support [Carl]

plugins/boot.lua

@@ -20,6 +20,8 @@ function lfs.env_replace(str)
 	end
 	return str
 end
+
+_G._ = emu.lang_translate
 local dir = lfs.env_replace(manager:options().entries.pluginspath:value())
 
 package.path = dir .. "/?.lua;" .. dir .. "/?/init.lua"

plugins/cheat/init.lua

@@ -680,7 +680,7 @@ function cheat.startplugin()
 			  end,
 			  function()
 				return menu_populate()
-			  end, "Cheat")
+			  end, _("Cheat"))
 
 	emu.register_start(function()
 		if not stop then

src/frontend/mame/luaengine.cpp

@@ -746,6 +746,7 @@ void lua_engine::initialize()
  * emu.print_info(str) -- output to stderr at info level
  * emu.print_debug(str) -- output to stderr at debug level
  * emu.driver_find(driver) -- find and return game_driver for driver
+ * emu.wait(len) -- wait from len within coroutine
  */
 	sol::table emu = sol().create_named_table("emu");
 	emu["app_name"] = &emulator_info::get_appname_lower;
@@ -806,6 +807,7 @@ void lua_engine::initialize()
 			engine->machine().scheduler().timer_set(attotime::from_double(lua_tonumber(L, 1)), timer_expired_delegate(FUNC(lua_engine::resume), engine), 0, L);
 			return lua_yield(L, 0);
 		});
+	emu["lang_translate"] = &lang_translate;
 
 /*
  * emu.file([opt] searchpath, flags) - flags can be as in osdcore "OPEN_FLAG_*" or lua style with 'rwc' with addtional c for create *and truncate* (be careful)