This wiki has po support enabled.

If the po plugin is enabled, the regular 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.
• "needstranslation()" - tests whether a page needs translation work. Only slave pages match this PageSpec. A minimum target translation percentage can optionally be passed as an integer parameter: "needstranslation(50)" matches only pages less than 50% translated.

Note that every non-po page is considered to be written in po_master_language, as specified in ikiwiki.setup.