Fix wrapping of text in HTML e-mails.

The <pre> tags for the text for comments, description, etc. weren't
wrapped in some browsers, making it hard to read anything in some e-mail
clients. We now use every wrapping mechanism we can use. This fixes wrapping
in several clients, including the iPhone/iPad mail clients and GMail Mobile.

Tested on GMail and the iPhone Mail client. The <pre> tags now wrap.