Strange behaviour with language and search


I encounter the following problem. I have created a wiki a few months ago. I have imported a bit more than 90 pages from another subwiki. After recognising, that the search does not work I changed the locale from de_de to de and pressed update in the search settings.

When searching now, I get some pages in German but 80% are missing. The retrieval set shows that of 40 pages retrieved only 6 pages were in German, but 3 pages are in Danish, 3 in Catalin, 7 in English , 3 in Spanish and so on.

All pages were created in German and the search expression “Richtlinie” is a German word.

Any hints what went wrong ?