You should probably mention what technology you are using for the translations. Also the issue seems to be that you are using a sub-folder for each language. Ex: https://www.hollandmarineparts.nl works but https://www.hollandmarineparts.nl/nl doesn’t.
It seems that the routes are broken for when you have a language other than default. (determined from the errors in the browser console)
EDIT: The route to yours plugins.js and scripts.js is breaking. It prints:
Uncaught SyntaxError: Unexpected token <
because it can’t find them and it’s returning index.html.
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solved Display issues on website after selecting language [closed]