The GNU website has infrastructure for supporting “What's New”, also known as “GNU News”—see http://www.gnu.org/server/standards/README.webmastering.html#polnews for details. Entries are added in a special plain text file, server/whatsnew.txt and are used to build server/whatsnew.include and gnusflashes.include. The former is used by server/whatsnew.html, while the latter is included in the homepage.
GNUN has additional rules for building whatsnew.pot, which contains a combination of all necessary strings for server/whatsnew.lang.html, server/whatsnew.lang.include and gnusflashes.lang.include. There is nothing unusual in this POT file, so it should be translated like any other. When you commit whatsnew.lang.po, it will be used to generate all three localized files. In addition, if there is a homepage for this language, it will be rebuilt when gnusflashes.lang.include is generated for the first time in order the translated homepage to include it instead of gnusflashes.include.
Note that localized RSS feeds are not supported on purpose, as it would be annoying for subscribers if new items appear in English and then once again translated.