intltool-extract hardcode " for glade attributes

[Christophe Fergeau]

If a glade file uses translatable='yes' to mark something as translatable, intltool-extract won't find this string while translatable="yes" will work.
type_glade() does:
 while ($input =~ /<(\w+)\s+[^>]*translatable\s*=\s*"yes"(?:\s+[^>]*context\s*=\s*"([^"]*)")?(?:\s+[^>]*comments\s*=\s*"([^"]*)")?[^>]*>([^<]+)<\/\1>/sg) {
ie "yes" is hardcoded and 'yes' is not accepted. The 'parsing' of the context and comments attributes have the same issue.

[Christophe Fergeau (teuf-gnome)]

So this bug is
- older than #1034153
- has more details that #1034153.
yet it's marked as a duplicate of #1034153 ?