translation – month names not translating into the Mikado event list

Hello, I develop this website where I translate the site in Dutch (België). The kernel is already set on this language, but I had to translate the theme into that language, which is almost complete, except for the events page.

On this page https://www.motoduro.com/off-road-motorreizen/ The events are broadcast in English. I have tried to translate to loco, but that does not change anything.

The nl-BE months are:

januari
februari
maart
April
Mei
Juni
Juli
August
September
October
November
December