Rewrite links to work with cdn to avoid 403 errors for bug 985737

Update links so that they reference CDN versions of files, will rewrite within Fireplace for Fireplace-safe URLs. Note that we have at least 3 conventions going on for these types of internal links, and sometimes within the same file all 3 were used. Also, there are varying number of links within localized files. The Polish localizations sometimes have no links at all.