Add Esperanto translation (#625)

mesecons_button/init.lua

@@ -1,6 +1,7 @@
 -- WALL BUTTON
 -- A button that when pressed emits power for 1 second
 -- and then turns off again
+local S = minetest.get_translator(minetest.get_current_modname())
 
 mesecon.button_turnoff = function (pos)
 	local node = minetest.get_node(pos)
@@ -45,7 +46,7 @@ minetest.register_node("mesecons_button:button_off", {
 	}
 	},
 	groups = {dig_immediate=2, mesecon_needs_receiver = 1},
-	description = "Button",
+	description = S("Button"),
 	on_rightclick = function (pos, node)
 		minetest.swap_node(pos, {name = "mesecons_button:button_on", param2=node.param2})
 		mesecon.receptor_on(pos, mesecon.rules.buttonlike_get(node))
@@ -92,7 +93,7 @@ minetest.register_node("mesecons_button:button_on", {
     },
 	groups = {dig_immediate=2, not_in_creative_inventory=1, mesecon_needs_receiver = 1},
 	drop = 'mesecons_button:button_off',
-	description = "Button",
+	description = S("Button"),
 	sounds = mesecon.node_sound.stone,
 	mesecons = {receptor = {
 		state = mesecon.state.on,