Add a common base email template, translate the emails over to using jinja and add emails when e-mail addresses and passwords are changed.

emails/changeemail.html

@@ -0,0 +1,13 @@
+{% extends "base.html" %}
+
+{% block content %}
+
+<h3>E-mail Address Change Requested</h3>
+
+This email address was recently asked to become the new e-mail address for user {{ username | user_reference }}.
+<br>
+<br>
+To confirm this email address, please click the following link:<br>
+{{ app_link('confirm?code=' + token) }}
+
+{% endblock %}