Update template.html.jinja: improve comment wording

Author: m-aciek

template.html.jinja

@@ -48,7 +48,7 @@
 {% endfor %}
 </tbody>
 </table>
-<p>* the number in parentheses shows change in the last 30 days, included in the total progress</p>
+<p>* the number in parentheses shows change in the last 30 days, included in the total completion</p>
 <p>For more information about translations, see the <a href="https://devguide.python.org/documentation/translating/" target="_blank">Python Developer’s Guide</a>.</p>
 <p>Last updated at {{ generation_time.strftime('%A, %-d %B %Y, %-H:%M:%S %Z') }} (in {{ duration // 60 }}:{{ "{:02}".format(duration % 60) }} minutes).</p>
 </body>