Donate form on website in English

Hi, this is probably quite a stupid question, but I cannot manage to get the text that [doneren_met_mollie] shows me to be in English. Instead, it gives me the Dutch terms, such as “bedrijfsnaam” and “bedrag”. Does someone know how I can force these to be English (including the payment menu)? The whole website is in English and this is the only unsynchronized part.