use lang key

templates/clientarea.tpl

@@ -100,7 +100,12 @@
                     </tr>
                     <tr>
                       <td></td>
-                      <td><a href="/upgrade.php?type=package&id={$id}" class="btn btn-block btn-primary">Jetzt upgraden</a></td>
+                      <td>
+                        {if $status == "{lang key='clientareaterminated'}"}
+                        {else}
+                        <a href="/upgrade.php?type=package&id={$id}" class="btn btn-block btn-primary">Jetzt upgraden</a>
+                        {/if}
+                      </td>
                     </tr>
                   {/if}
                 </table>