Bug#808262: http://planet.debian.org/opml.xml produces an error because there is a non-escaped char " in one feed title

Hi all

I don't know Django but for what I've read, I think that adding braces
to the variables related to the title in /templates/opml.xml
may escape the quotes, and solve this issue.

I'm attaching a patch for the opml.xml template; please apply it if
you think it's correct; or I can apply some days later if nobody
complains (I guess that would only break the opml feed if it's wrong,
and that feed is broken now anyways...).

Cheers