Add a new templatetag to render modified on and by line in documents. Add the necessary div tags, html templates, templatetag function and the CSS to give necessary layout and styling.

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<div id="modification">

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  Created on {{ modification_datetime|date:"r" }} by

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  <a href="{% url view_user_profile user.id %}">

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    {{ user.get_profile.full_name }}

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  </a>

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</div>