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Currently translated at 86.7% (13 of 15 strings)

During the "scan" phase, ikiwiki first scans raw PO files, including these
obsolete strings. We have "[[!command]]" ikiwiki directives split over multiple
strings, so in these raw PO files, a directive can be started ("[[!command") but
never closed ("]]"), which can cause this warning:

  Complex regular subexpression recursion limit (32766) exceeded at
  /usr/share/perl5/IkiWiki.pm line 1754.

I suspect that other kinds of power-usage of ikiwiki + PO files can trigger this
problem; let's fix this one to start with and see what happens then.

refs: #16847