Issue with wp_localize_script

You should remove trailing slash / from 3rd line.

$ait_pfad = plugin_dir_url( __FILE__ ) . '/assets/js/ait_buttons.js';

this should be

$ait_pfad = plugin_dir_url( __FILE__ ) . 'assets/js/ait_buttons.js';

wp_plugin_dir() function returns url including a trailing slash (“https://wordpress.stackexchange.com/”) so you should not add it again.

Please read wp_plugin_dir() function reference to learn more about this function.

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