Fix typos and en_US/en_GB inconsistency in various files (#12902)

builtin/game/item.lua

@@ -243,7 +243,7 @@ function core.item_place_node(itemstack, placer, pointed_thing, param2,
 	if core.get_item_group(def.name, "attached_node") ~= 0 and
 		not builtin_shared.check_attached_node(place_to, newnode) then
 		log("action", "attached node " .. def.name ..
-			" can not be placed at " .. core.pos_to_string(place_to))
+			" cannot be placed at " .. core.pos_to_string(place_to))
 		return itemstack, nil
 	end
 

builtin/game/item_entity.lua

@@ -103,7 +103,7 @@ core.register_entity(":__builtin:item", {
 
 	try_merge_with = function(self, own_stack, object, entity)
 		if self.age == entity.age then
-			-- Can not merge with itself
+			-- Cannot merge with itself
 			return false
 		end
 
@@ -113,7 +113,7 @@ core.register_entity(":__builtin:item", {
 				own_stack:get_meta() ~= stack:get_meta() or
 				own_stack:get_wear() ~= stack:get_wear() or
 				own_stack:get_free_space() == 0 then
-			-- Can not merge different or full stack
+			-- Cannot merge different or full stack
 			return false
 		end
 

builtin/game/knockback.lua

@@ -1,4 +1,4 @@
--- can be overriden by mods
+-- can be overridden by mods
 function core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, distance, damage)
 	if damage == 0 or player:get_armor_groups().immortal then
 		return 0.0

builtin/game/misc.lua

@@ -121,7 +121,7 @@ function core.get_player_radius_area(player_name, radius)
 end
 
 
--- To be overriden by protection mods
+-- To be overridden by protection mods
 
 function core.is_protected(pos, name)
 	return false