MT5 translation for homedecor_common

- Remove intllib support
- Fix luacheck warnings (except for 1 I don't know what to do)
- Removes homedecor_common/mt_game_beds_functions.lua (we can get the
function directly from `beds` mod instead of using an obsolete copie; I
have not re-enabled bed-sleeping, but it should work)

homedecor_common/furnaces.lua

@@ -1,6 +1,6 @@
 -- This code supplies an oven/stove. Basically it's just a copy of the default furnace with different textures.
 
-local S = homedecor.gettext
+local S = minetest.get_translator("homedecor_common")
 
 local function swap_node(pos, name)
 	local node = minetest.get_node(pos)