fixes #1789

app/models/tag_alias.rb

@@ -163,4 +163,11 @@ class TagAlias < ActiveRecord::Base
       end
     end
   end
+
+  def deletable_by?(user)
+    return true if user.is_admin?
+    return true if is_pending? && user.is_janitor?
+    return true if is_pending? && user.id == creator_id
+    return false
+  end
 end

app/models/tag_implication.rb

@@ -164,4 +164,11 @@ class TagImplication < ActiveRecord::Base
     clear_parent_cache
     clear_descendants_cache
   end
+
+  def deletable_by?(user)
+    return true if user.is_admin?
+    return true if is_pending? && user.is_janitor?
+    return true if is_pending? && user.id == creator_id
+    return false
+  end
 end