Checkout page language when developer mode is enabled

There's nothing you can do about this. The checkout page is beyond reach, regardless of whether Developer Mode is enabled. 

Disabling Developer Mode will allow a single language to be selected again. If you require different checkout languages on Squarespace, the only solution that I recommend is Weglot. This doesn't change the code on the checkout page itself (because this isn't possible) but it passes all the site traffic via Weglot's own translation servers (by changing your DNS settings) so that the page can be shown in different languages.

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Hi Paul, thanks for the answer.

Actually the checkout page in French only would be perfect. But I really don't dare to disable the developer mode as I've read it would remove all custom developments. I'll have a deeper look in weglot (already checked it as you mentioned it a couple of times in other threads but superficially).