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/recovery.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+
+{% block content %}
+
+<h3>Account recovery</h3>
+
+A user at {{ app_link() }} has attempted to recover their account
+using this email address.
+<br>
+<br>
+If you made this request, please click the following link to recover your account and
+change your password:
+{{ app_link('recovery?code=' + token) }}
+<br><br>
+If you did not make this request, your account has not been compromised and the user was
+not given access. Please disregard this email.
+
+{% endblock %}