DonationInterface has links to https://wikimediafoundation.org/wiki/Ways_to_Give/en and problemsdonating@wikimedia.org sprinkled throughout templates and i18n messages. These should be tokenized and any language parameter should be explicitly indicated as with $wgDonationInterfaceAppealWikiTemplate.
There's nothing functional about this, but if we want to have other people using DI, we should do this.