Change Desc Chg column to status column

- Add a diff column
- Reword post column name for better clarity

app/helpers/pool_versions_helper.rb

@@ -3,4 +3,19 @@ module PoolVersionsHelper
     params.dig(:search, :pool_id).present? ? :revert : :standard
   end
 
+  def pool_version_status_diff(pool_version)
+    cur = pool_version
+    prev = pool_version.previous
+
+    return "New" if prev.blank?
+
+    status = []
+    status += ["Renamed"] if cur.name != prev.name
+    status += ["DescChanged"] if cur.description != prev.description
+    status += ["Deleted"] if cur.is_deleted? && !prev.is_deleted?
+    status += ["Undeleted"] if !cur.is_deleted? && prev.is_deleted?
+    status += ["Activated"] if cur.is_active? && !prev.is_active?
+    status += ["Deactivated"] if !cur.is_active? && prev.is_active?
+    status.join(" ")
+  end
 end