In the definition on MSDN it states
"The name or lcid can be specified in the full-text queries and full-text index DDL."refers to the ability to issue the following SQL:
WHERE CONTAINS(*, 'the', language 1045 )
which indicates that the locale used for querying should be 1045, which equates to Polish. I have some sample SQL to post in the next few days which demonstrates the difference between indexing and querying language choices.
I've been doing quite a bit of work with trying to understand how the SQL Server 2005 full text index works, and how the language choice impacts it. My knowledge of full text indexing as a whole to this stage hasn't been great, so I've done quite a lot of background reading. Amongst the best resources I've found are:Hillary Cotter which provide a really simple, but yet pretty comprehensive introduction to the various features of indexing and querying using the Full Text Index service.