Hello Elise,
I just tried and its working fine on storefront theme
I found this error code on the checkout page on both languages
address-i18n.min.js?ver=4.5.2:1 Uncaught TypeError: Cannot read property ' address_1' of undefined
at String.<anonymous> (address-i18n.min.js?ver=4.5.2:1)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at HTMLBodyElement.<anonymous> (address-i18n.min.js?ver=4.5.2:1)
at HTMLBodyElement.dispatch (jquery.js?ver=1.12.4-wp:3)
at HTMLBodyElement.r.handle (jquery.js?ver=1.12.4-wp:3)
at Object.trigger (jquery.js?ver=1.12.4-wp:3)
at HTMLBodyElement.<anonymous> (jquery.js?ver=1.12.4-wp:3)
at Function.each (jquery.js?ver=1.12.4-wp:2)
at n.fn.init.each (jquery.js?ver=1.12.4-wp:2)
at n.fn.init.trigger (jquery.js?ver=1.12.4-wp:3)