The german localization titles the sub gifter badge as "Person, die das Abonnement verschenkt" which equates to "person who gifts the sub" in english. This sounds very unnatural. Closer to the english "sub gifter" would be something along the lines of "Abo-Verschenker". Another more natural alternative would also be "Person, die ein Abo verschenkt hat" which translates to "person who has gifted a sub".