gettext/po4a rough corners
--------------------------
-- commiting a new master page version updates the translations, but
- does not refresh recentchanges anymore after having checked-in the
- new translations (since manual IkiWiki::refresh() call was removed,
- I guess)
- fix infinite loop when synchronizing two ikiwiki (when checkouts
live in different directories): say bla.fr.po has been updated in
repo2; pulling repo2 from repo1 seems to trigger a PO update, that
`po_link_to = current`: seems to work nicely
-### parentlinks
-
-When `usedirs` is disabled and the home page is translatable, the
-parent link to the wiki home page is broken (`/index.html`).
-
Translation quality assurance
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