We deprecated Document#getTranslationList() in favor of the new Document#getTranslationLocales() so if you have Velocity scripts using $doc.translationList you'll notice a deprecation warning in the server logs which you can avoid by using $doc.translationLocales instead.
We also added XWiki#getAvailableLocales() so you can now replace
$xwiki.getXWikiPreference('languages').split('\s*[|, ]\s*')
with $xwiki.availableLocales in your Velocity scripts.