Update templates/includes/authenticated.html

Co-authored-by: Hugo van Kemenade <1324225+hugovk@users.noreply.github.com>

Author: czc0407

templates/includes/authenticated.html

@@ -17,7 +17,7 @@
                         {% endif %}
                     {% else %}
                         <a href="{% url 'account_login' %}?next=https://psfmember.org/membership/">
-                            Login to manage membership
+                            Log in to manage membership
                         </a>
                     {% endif %}
                 </li>