Update to 3.141592. From the changelog:

* Add new hooks: canremove, canrename, rename. (intrigeri)
* rename: Refactor subpage rename handling code into rename hook.
    (intrigeri)
* po: New plugin, suporting translation of wiki pages using po
    files. (intrigeri)
* Add build machinery to build po files to translate the underlay wikis,
* Add further build machinery to generate translated underlays from
    the po file, for use by wikis whose primary language is not English.
* Add Danish basewiki translation by Jonas Smedegaard.
* img: Fix adding of dependency from page to the image.
* pagestats: add among parameter, which only counts links from
    specified pages (smcv)
* pagestats: when making a tag cloud, don't emit links where the
    tag is unused (smcv)
* map: Avoid emitting an unclosed ul element if the map is empty.
    (harishcm)
* inline: Add pagenames parameter that can be used to list a set
    of pages to inline, in a specific order, without using a PageSpec.
    (smcv)
* Add getsource plugin (Will, smcv)

Note that the new po plugin won't work until textproc/po4a is updated
to at least 0.34. Any takers?

(schmonz)