convert/svn: fix HTTP detection bug introduced by
1b2516a547d4
The probe expected response is a 404 with content, and while urllib returns the
response body in this case, urllib2 raises an HTTP error.
record: handle translated prompt correctly
The prompt function would return 'y' or 'n' untranslated. This should
therefore not be compared to _('y') and _('n'). However, it turns out
that prompt could just as well return a good old Boolean.