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- The API sandbox and help pages now show more clearly when API modules are marked as
internal. API modules marked as internal were probably internal before. It was easier to miss. You should look for non-internal alternatives. 
- There is a translation tool we use on wikis with more than one language. For a few days it did not create pages for new languages when someone translated a page. The languages did not show in the language bar. This has been fixed. 
- The history and diffs can show wrong content. This is because of a cache problem. It will soon be fixed. 
Changes later this week
- The new version of MediaWiki will be on test wikis and MediaWiki.org from 22 October. It will be on non-Wikipedia wikis and some Wikipedias from 23 October. It will be on all wikis from 24 October (calendar).
- Reference Previews will be a beta feature on all Wikipedias and some Wikivoyages. It shows you a preview of the footnote when you hover over or click on the number. It has been a beta feature on German and Arabic Wikipedia since April.
- You can join the technical advice meeting on IRC. During the meeting, volunteer developers can ask for advice. The meeting will be on 23 October at 15:00 (UTC). See how to join.