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Hi @mgoetz75,
The font reference is hard-coded into the aqua.css file of the wpdatatables plugin: https://mc-seminar.de/wp-content/plugins/wpdatatables/assets/css/wdt-skins/aqua.css?ver=4.5
Only the plugin developer can modify hard-coded references, so you would need to reach out to them in this case.
Let me know if I can help with anything else.
Thanks