The reset password e-mail is using an incorrect translation string

We're using:

```python
    reset_link_message = _(
    '''You have requested your password on %(site_title)s to be reset.
    
    Please click the following link to confirm this request:
    
       %(reset_link)s
    ''')
```

Which ends up creating a string with extra whitespace before the paragraphs,
like "...to be reset\n\n    Please click the following...".

But the i18n message key doesn't have these whitespaces, so we always send
that in English. To solve it, we could either fix the message key in all .po
files, or change how we construct the string in ```mailer.py```. I prefer the
latter.