rename volume button in sounds

inventory_plus/init.lua

@@ -130,7 +130,7 @@ minetest.register_on_joinplayer(function(player)
 
 	inventory_plus.register_button(player,"craft", "Craft")
     inventory_plus.register_button(player,"character_creator", "Charakter")
-    inventory_plus.register_button(player,"volume", "Volume")
+    inventory_plus.register_button(player,"volume", "Sounds")
 	
     if minetest.setting_getbool("creative_mode") then
 		inventory_plus.register_button(player, "creative_prev", "Creative")