Problem with changing language to croatian

I have problem with changing language from english to croatian. When I change language to croatian I have problem with checkout bottun next to cart bottun. When I change language to croatin checkout bottun disappear.

If I continue in english language and try to change it manually I can’t find it in change theme laungauge page.

I have also problem with finding - when you hit add to cart bottun. (…has been successfully added to your cart Feel free to continue shopping or

check out.) - when i change it to to croatian, it disappear.

When page is in english, everything works perfectly.

Basically I would like to change language to croatian and find this two missing part. (checkout bottun disappear and has been successfully added to your cart - when i hit add to card bottun)

I am new to shopify platform.

How to contact shopify help diretly? email or chat?