Ah, I see! Many thanks! Based on Wikipedia, eBay and Taobao I made a list of the various language variations available for the series. I don't think it's 100% complete, so if you know about a variant not listed below, please let me (us) know.
(Also, I don't know if the various season updates and extras were also available in all regions...)
WCCF 2001-02: Japanese
WCCF 2002-03: Japanese, Italian
WCCF 2004-05: Japanese, English
WCCF 2005-06: Japenese, English
WCCF 2006-07: Japanese
WCCF 2007-08: Japanese
WCCF 2008-09: Japanese
WCCF 2009-10: Japanese, Chinese
WCCF 2010-11: Japanese, Chinese
WCCF 2011-12: Japanese, Chinese
WCCF 2012-13: Japanese, Chinese
WCCF 2013-14: Japanese
WCCF 2014-15: Japanese
WCCF 2015-16: Japanese
WCCF 2016-17: Japanese
WCCF 2017-18: Japanese
WCCF Footista 2019: Japanese