User Registration Form error message customisation Where can I edit the error messages for the user registration form e.g for 

{% if account is defined %}
    {{ _self.errorList(account.getErrors('email')) }}
{% endif %}


I want to change this wording:

Email "tom.bowler@mailbox.net" has already been taken.

to something like:

Email "tom.bowler@mailbox.net" has already been taken. Login here instead...
You can do this using Craft's static translation support.

For example, if your site is using en_us for its primary locale, then add a craft/translations/en_us.php file that has this in it:

&lt;?php

return array(
    '{attribute} "{value}" has already been taken.' =&gt; '{attribute} "{value}" has already been taken. Login here instead.',
);