关闭背景时亮度可调

新增自定义图片背景功能（可调透明度，目前仅电脑可用）

parts/language/lang_es.lua

@@ -127,6 +127,7 @@ return{
     chatHistory="------Nuevos mensajes------",
 
     -- keySettingInstruction="Press to bind key\nescape: cancel\nbackspace: delete",
+    -- customBGhelp="Drop image file here to apply custom background",
 
     errorMsg="Ha ocurrido un error y Techmino necesita reiniciarse.\nSe creó un registro de error, puedes enviarlo al autor.",
     -- tryAnotherBuild="[Invalid UTF-8] If you are on Windows, try downloading Techmino-win32 or Techmino-win64 (different from what you are using now).",
@@ -356,7 +357,10 @@ return{
             power="Inf. de Batería",
             clean="Fast Draw",
             fullscreen="Pant. Completa",
-            bg="Fondo",
+
+            -- bg_on="Normal Backgrounds",
+            -- bg_off="No Background",
+            -- bg_custom="Apply Custom BG",
 
             blockSatur="Saturac. de los Bloques",
             fieldSatur="Saturac. del Tablero",