fix(front): display 'delete_user' on deployments (#197)

## 📝 Description

renderedtext/tasks#7752

## ✅ Checklist
- [x] I have tested this change
- [ ] This change requires documentation update

Author: VeljkoMaksimovic

front/lib/front_web/templates/deployments/_item.html.eex

@@ -98,7 +98,7 @@
 
             <p class="f6 mb1 gray">
                 Created <%= time_ago(@target.created_at) %> ·
-                Last edit by <%= @target.updator.name %>, <%= time_ago(@target.updated_at) %>
+                Last edit by <%= last_edited_by_label(@target.updator) %>, <%= time_ago(@target.updated_at) %>
             </p>
         </div>
     </div>

front/lib/front_web/views/deployments_view.ex

@@ -54,6 +54,9 @@ defmodule FrontWeb.DeploymentsView do
   def object_mode_icon(:NONE), do: "close"
   def object_mode_icon(:WHITELISTED), do: "rule"
 
+  def last_edited_by_label(_updator = nil), do: "deleted_user"
+  def last_edited_by_label(updator), do: updator.name
+
   def injectable(items) do
     items
     |> Enum.map(&Map.drop(&1, ~w(__struct__ __meta__)a))