[Plugin: The Events Calendar] HELP language problem

Hi,

I am having problems with languages setting in wordpress versus “The Events Calendar” plugin and searching for solution for 6 months now.

WordPress, version 3.2.1
The Events Calendar, version 1.6.5
https://www.ads-software.com/extend/plugins/the-events-calendar/

In General settings: Site language: Dutch; Flemish

But the days shown on the website from the “The Events Calendar” are still in English while the months are sometimes in English and sometimes in flemish.

The days and months and the complete site have to be in flemish.

https://beeldenstorm.be/beeldenstorm/blog/2011/08/29/beletterd-betekend-%E2%80%94-start-%E2%80%94-lerarendag/

Whats happening, after 6 months no solution found?!
Thanks for help.