The documentation wrongly uses the language code 'en-uk'. Such a language code doesn't exist. The second component of a language code is a country code; the country code for the United Kingdom is 'gb' (see http://www.iso. org/iso/en/prods-services/iso3166ma/02iso-3166-code-lists/list-en1.html#sz), which makes the language code for British English 'en-gb'. The same bug exists in the httpd 2.0 documentation, and in all the translations. Please also check if it is used somewhere in an configuration file.
The same bug in httpd 2.0 is recorded at http://issues.apache. org/bugzilla/show_bug.cgi?id=29518.
Thanks. Fixed.