chore: update placeholder

Author: dodumosu

apollo/participants/api/views.py

@@ -235,7 +235,7 @@ def _process_2fa_login(participant: Participant):
     result = _generate_or_retrieve_otp(key)
     if result:
         response = jsonify({"status": "ok", "data": {"uid": str(participant.uuid), "twoFactor": True}})
-        message = gettext("Your Apollo verification code is: %(code)s", code=result)
+        message = gettext("Your Apollo verification code is: %(totp_code)s", totp_code=result)
         send_message.delay(g.event.id, message, participant.primary_phone)
         return response
     else: