Polish and Turkish Numista site "hidden" from language selection

I have discovered the Numista website in two new different languages, Polish and Turkish. I did not know they existed before until I found them through searching online. I am wondering why those two languages do not exist in the language selection drop-down menu when I tried to find them there? If they were in the drop-down menu it would be helpful to Polish and Turkish speaking people, to indicate that the site is available in their language.

Hello, we have a couple of languages for which translation is started, but still far from completion. We want to reach a certain level of translation coverage before advertising them.

By the way, if anyone wants to help with the translation in Polish, Turkish, Greek or Japanese,  feel free to contact @Jarcek or me.