For example, https://www.mediawiki.org/w/index.php?title=MediaWiki:Donate_interface-informationsharing/es is still showing a version of the message which was updated on Nov 22, in patch https://gerrit.wikimedia.org/r/#/c/175252/
Maybe I don't understand how LocalisationUpdate is supposed to work, or DonationInterface messages are not being pulled in by that mechanism. This extension is a bit special, cos there are multiple i18n subdirectories...