magento2 – How can i configuare a multi language website?

I have created following store structure;

Website: xxx.de
Store: Germany
Store View: German

Website: xxx.nl
Store: Netherlands
Store View: Dutch

Website: xxx.fr
Store: France
Store View: French

I want to use all languages on other websites too like French and German on xxx.nl with Dutch language. I don’t want to create same languages under stores it’s to much work for translate and i do use “Add Store Code to Urls” option i will keep it too for all websites.