Hi Mika,
Thanks for getting in touch. The Events Calendar does not come with a Finnish translation, so I believe that error is in the WordPress translation. I wish I could get it fixed, but I’m afraid you’ll need to get in touch with the folks involved with the Finnish translation. There’s a link on the WordPress Codex language page that will hopefully get you started. I’m sorry I can’t be of more help here. If you’re interested in doing a Finnish translation for The Events Calendar and Events Calendar PRO, definitely email us at pro (at) tri.be. Although I don’t believe a translation would overwrite that particular issue, unfortunately.
Best,
Leah