[[!if test="enabled(po)"
     then="This wiki has po support **enabled**."
     else="This wiki has po support **disabled**."]]

If the [[po|plugins/po]] plugin is enabled, the regular
[[ikiwiki/PageSpec]] syntax is expanded with the following additional
tests that can be used to improve user navigation in a multi-lingual
wiki:

* "`lang(LL)`" - Tests whether a page is written in the language
  specified as a ISO639-1 (two-letter) language code.
* "`currentlang()`" - Tests whether a page is written in the same
  language as the current page.

Note: every non-PO page is considered to be written in
`po_master_language`, as specified in `ikiwiki.setup`.