Available in a git repository branch.
Branch: feature/15355-po-plugin-disable-languages
Author: intrigeri

po_disabled_languages is used to disable languages on the website. It can be used to prepare new translations, while it will hide those from the end-user. More precisely, PO files for these languages are updated normally, however, HTML creation will be disabled and no reference to these translations will be visible on the website.

See also downstream bug report in tails: https://labs.riseup.net/code/issues/15355

From the downstream bug report it appears this branch is not yet considered ready (as of February 2019), so I haven't attempted to review it.

As with everything else in the po plugin: I would really want to see some regression test coverage before merging this, because as far as I'm aware none of the ikiwiki maintainers use the po plugin, so we are not able to detect regressions other than via the automated tests. That isn't a good situation to be in for a plugin that uses IkiWiki::inject to monkey-patch ikiwiki internals. If this plugin is important to you, more test coverage would be very much appreciated. --smcv

I've put this branch into a shape that I now dare submitting: https://salsa.debian.org/tails-team/ikiwiki/tree/feature/15355-po-plugin-disable-languages. It adds a little bit test coverage in the form of integration tests for the proposed feature, that incidentally exercise the rest of the basic functionality of the PO plugin. Credits go to hefee for the initial work; I merely did a lot of polishing. Happy to squash all this into a single commit if you prefer. --intrigeri