Can I change the text of the “Withdraw from contract here” button label?

Yes, through translations (Loco Translate, Poedit, etc.) or through the buddypilot_withdrawal_button_label filter. The default text is translated from PL/EN included with the plugin and comes from the literal wording of Article 11a – changing it is possible, but we recommend consulting with a lawyer to ensure the new text meets the requirement of a “clearly visible, easily accessible withdrawal function”.