修复语言文件小问题

parts/language/lang_es.lua

@@ -360,7 +360,7 @@ return{
             fullscreen="Pant. Completa",
 
             bg_on="Fondo Normal",
-            bg_on="Sin Fondo",
+            bg_off="Sin Fondo",
             bg_custom="Fondo Personalizado",
 
             blockSatur="Saturac. de los Bloques",

parts/language/lang_fr.lua

@@ -357,7 +357,7 @@ return{
             fullscreen="Plein écran",
 
             -- bg_on="Normal B.G.",
-            -- bg_on="No B.G.",
+            -- bg_off="No B.G.",
             -- bg_custom="Use Custom B.G.",
 
             -- blockSatur="Block Saturation",

parts/language/lang_pt.lua

@@ -382,7 +382,7 @@ return{
             fullscreen="Tela cheia",
 
             -- bg_on="Normal B.G.",
-            -- bg_on="No B.G.",
+            -- bg_off="No B.G.",
             -- bg_custom="Use Custom B.G.",
 
             -- blockSatur="Block Saturation",