Ok, I found a solution that’s good enough for me. I added a hook to my functions.php that modifies the gallery shortcode output so that it takes the alt text from the image and enters it as the title text in the image link. This way I can use alt texts as the WP team suggests, and still get Swipebox to work. I’m not a professional programmer though, so I’m not sure if the solution works for any other site than mine. But that’s all I need for know anyway.
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