My configuration in site.ini for the site with one language has only swe-SE in RegionalSettings. I also followed all the steps in the upgrade.
Anyway the problem is now solved.
The problem was: I used the same database for a site with 3 languages as I did for the site with one language.
When there is content objects in the database of more than one language the admin interface will always show this extra step...
I had to copy the database and I now use two different databases. In one of the databases I deleted all content objects belonging to the multi-lingual site. Then I deleted the two extra languages from the admin interface (Setup/Languages).
The extra step is now gone in the admin interface for the site with one language! Good!
/Anja
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Anja Lundin
Developer, Novitell AB
Sweden