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Sorry, I already deactivated it. The elements in the header are basically a list of <li>, so it would basically be enough to change the order to place them to the right. But I don’t know how, as well as the arrangement of the flags themselves.
UPDATE:
I’ve figured it out.
1. To place an element at the end of a list, you only need to know the id.
$("#menu-item-1124").appendTo("#primary-menu");
2. Flags are only a list <a> in <li>. Therefore, you only need to adjust their display.
$("#primary-menu > li > a").css("display", "inline-block");
Then it is still possible to add spaces so that the flags are not crammed side by side.
$("#menu-item-1124 > a").css("padding-right", "10px");
Thank you anyway.