Ignore if you have already created child theme .After it Create a new file in the child theme with name header-menu-section.php and edit it, then paste the code in it from https://pastebin.com/QdLXwm07
That works when I look at the mobile view via the "customizer" but online in the live-site I still see "Navigation Menu" although I refreshed the page many times. What do I do wrong?
Yes you really did, I haven't found out the code myself ;-). But indeed, I want the change the text "navigation menu" in the mobile view to something else.
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$('.navbar-toggle').text('Menu');
});