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Hey Alex,
Sorry for the late reply.
Thank you for your suggestions.
button text in the google maps element
This is intended as anchor tags may only contain a limited set of tags ( see e.g. https://stackoverflow.com/questions/3379392/what-elements-can-be-contained-within-a-a-tag) and to avoid breaking the site for not so experienced users (and translators).
Did you see the filter ‘avf_google_maps_confirm_overlay’? This allows you to redesign the overlay in a child theme without touching the core element.
What I also could offer is to add a filter specific for the overlay text.
Best regards,
Günter