rss and atom feed of l10n news show po file source

when accessing a localized version of the rss or atom feed, the content of the entries shows the source of the po files:
https://tails.boum.org/news/index.de.atom
https://tails.boum.org/news/index.de.rss

Feature Branch: bugfix/9671-no-inline-for-release-notes

Related issues

• Related to #10124 (closed)
• Related to #6907 (closed)
• Related to #11135 (closed)

Original created by @muri on 9671 (Redmine)