Fiance(e) visa K1- legalized translations- Hague Apostille

[madlene]

Hi! me and my fiance are ready to start this K1 "journey" and i just don't want to mess up things from the beginning. So i would like to know if all the documents that i will have to translate need to have the Hague Apostille. (my country signed this convention so normally the docs need that apostille).I ve done my research but i have found no clear answer over this matter. And if i need that Apostille , is it necessary to apply it on the original document or on the translation of the original doc?
Many thanks!