Rename metal sheets to iron sheets (#56643)

It's a specific type of metal, it shouldnt just be called generic "metal".
The reagent, ore and material datum are already called iron.

code/game/objects/items/stacks/sheets/glass.dm

@@ -150,7 +150,7 @@ GLOBAL_LIST_INIT(reinforced_glass_recipes, list ( \
 /obj/item/stack/sheet/rglass/cyborg
 	mats_per_unit = null
 	cost = 250
-	source = /datum/robot_energy_storage/metal
+	source = /datum/robot_energy_storage/iron
 
 	/// What energy storage this draws glass from as a robot module.
 	var/datum/robot_energy_storage/glasource = /datum/robot_energy_storage/glass

code/game/objects/items/stacks/sheets/light.dm

@@ -15,15 +15,15 @@
 	merge_type = /obj/item/stack/light_w
 
 /obj/item/stack/light_w/attackby(obj/item/O, mob/user, params)
-	if(istype(O, /obj/item/stack/sheet/metal))
-		var/obj/item/stack/sheet/metal/M = O
+	if(istype(O, /obj/item/stack/sheet/iron))
+		var/obj/item/stack/sheet/iron/M = O
 		if (M.use(1))
 			var/obj/item/L = new /obj/item/stack/tile/light(user.drop_location())
 			to_chat(user, "<span class='notice'>You make a light tile.</span>")
 			L.add_fingerprint(user)
 			use(1)
 		else
-			to_chat(user, "<span class='warning'>You need one metal sheet to finish the light tile!</span>")
+			to_chat(user, "<span class='warning'>You need one iron sheet to finish the light tile!</span>")
 	else
 		return ..()
 

code/game/objects/items/stacks/sheets/sheet_types.dm

@@ -1,6 +1,6 @@
 /* Diffrent misc types of sheets
  * Contains:
- * Metal
+ * Iron
  * Plasteel
  * Wood
  * Cloth
@@ -12,7 +12,7 @@
  */
 
 /*
- * Metal
+ * Iron
  */
 GLOBAL_LIST_INIT(metal_recipes, list ( \
 	new/datum/stack_recipe("stool", /obj/structure/chair/stool, one_per_turf = TRUE, on_floor = TRUE), \
@@ -63,7 +63,7 @@ GLOBAL_LIST_INIT(metal_recipes, list ( \
 	new/datum/stack_recipe("canister frame", /obj/structure/canister_frame/machine/frame_tier_0, 5, time = 8, one_per_turf = TRUE, on_floor = TRUE), \
 	null, \
 	new/datum/stack_recipe("floor tile", /obj/item/stack/tile/plasteel, 1, 4, 20), \
-	new/datum/stack_recipe("metal rod", /obj/item/stack/rods, 1, 2, 60), \
+	new/datum/stack_recipe("iron rod", /obj/item/stack/rods, 1, 2, 60), \
 	null, \
 	new/datum/stack_recipe("wall girders", /obj/structure/girder, 2, time = 40, one_per_turf = TRUE, on_floor = TRUE, trait_booster = TRAIT_QUICK_BUILD, trait_modifier = 0.75), \
 	null, \
@@ -114,46 +114,46 @@ GLOBAL_LIST_INIT(metal_recipes, list ( \
 	new/datum/stack_recipe("shower frame", /obj/structure/showerframe, 2, time= 2 SECONDS)
 ))
 
-/obj/item/stack/sheet/metal
-	name = "metal"
-	desc = "Sheets made out of metal."
-	singular_name = "metal sheet"
+/obj/item/stack/sheet/iron
+	name = "iron"
+	desc = "Sheets made out of iron."
+	singular_name = "iron sheet"
 	icon_state = "sheet-metal"
 	inhand_icon_state = "sheet-metal"
 	mats_per_unit = list(/datum/material/iron=MINERAL_MATERIAL_AMOUNT)
 	throwforce = 10
 	flags_1 = CONDUCT_1
 	resistance_flags = FIRE_PROOF
-	merge_type = /obj/item/stack/sheet/metal
+	merge_type = /obj/item/stack/sheet/iron
 	grind_results = list(/datum/reagent/iron = 20)
 	point_value = 2
 	tableVariant = /obj/structure/table
 	material_type = /datum/material/iron
 	matter_amount = 4
 	cost = 500
-	source = /datum/robot_energy_storage/metal
+	source = /datum/robot_energy_storage/iron
 
-/obj/item/stack/sheet/metal/narsie_act()
+/obj/item/stack/sheet/iron/narsie_act()
 	new /obj/item/stack/sheet/runed_metal(loc, amount)
 	qdel(src)
 
-/obj/item/stack/sheet/metal/fifty
+/obj/item/stack/sheet/iron/fifty
 	amount = 50
 
-/obj/item/stack/sheet/metal/twenty
+/obj/item/stack/sheet/iron/twenty
 	amount = 20
 
-/obj/item/stack/sheet/metal/ten
+/obj/item/stack/sheet/iron/ten
 	amount = 10
 
-/obj/item/stack/sheet/metal/five
+/obj/item/stack/sheet/iron/five
 	amount = 5
 
-/obj/item/stack/sheet/metal/get_main_recipes()
+/obj/item/stack/sheet/iron/get_main_recipes()
 	. = ..()
 	. += GLOB.metal_recipes
 
-/obj/item/stack/sheet/metal/suicide_act(mob/living/carbon/user)
+/obj/item/stack/sheet/iron/suicide_act(mob/living/carbon/user)
 	user.visible_message("<span class='suicide'>[user] begins whacking [user.p_them()]self over the head with \the [src]! It looks like [user.p_theyre()] trying to commit suicide!</span>")
 	return BRUTELOSS