Add revoke all blocks link

app/abilities/ability.rb

@@ -61,7 +61,7 @@ class Ability
           can [:index, :show, :resolve, :ignore, :reopen], Issue
           can :create, IssueComment
           can [:new, :create, :edit, :update, :destroy], Redaction
-          can [:new, :edit, :create, :update, :revoke], UserBlock
+          can [:new, :edit, :create, :update, :revoke, :revoke_all], UserBlock
         end
 
         if user.administrator?

app/views/users/show.html.erb

@@ -101,6 +101,12 @@
               </li>
             <% end %>
 
+            <% if can?(:revoke_all, UserBlock) and @user.blocks.active.exists? %>
+              <li>
+                <%= link_to t(".revoke_all_blocks"), revoke_all_user_blocks_path(@user) %>
+              </li>
+            <% end %>
+
             <% if can?(:create, UserBlock) %>
               <li>
                 <%= link_to t(".create_block"), new_user_block_path(@user) %>