If you want to add a other language then "en" you have to add a new folder named "PUT YOUR LANGUAGE CODE HERE.lproj" (de_DE or other) to your Resources folder in your .iOS Project and add a new text file called "BTUI.strings" which contains a list of translations.
BTUI.strings
"CARD_DETAILS_LABEL" = "Kreditkartendaten";
"ENTER_CARD_DETAILS_HELP_LABEL" = "Geben Sie Ihre Kreditkartendaten ein.";
"VALID_CARD_ERROR_LABEL" = "Sie müssen eine gültige Kartennummer angeben.";
"CARD_REQUIRED" = "Kartennummer ist erforderlich";
"CARD_INVALID" = "Kartennummer ist ungültig";
"EXPIRATION_REQUIRED" = "Ablaufdatum ist erforderlich";
"EXPIRATION_INVALID" = "Ablaufdatum ist ungültig";
"CVV_REQUIRED" = "%s ist erforderlich";
"CVV_INVALID" = "%s ist ungültig";
"POSTAL_CODE_HELP_LABEL" = "Geben Sie eine gültige PLZ ein.";
"POSTAL_CODE_REQUIRED" = "PLZ ist erforderlich";
"POSTAL_CODE_INVALID" = "PLZ ist ungültig";
"COUNTRY_CODE_REQUIRED" = "Ländervorwahl ist erforderlich";
"COUNTRY_CODE_INVALID" = "Ländervorwahl ist ungültig";
"MOBILE_NUMBER_REQUIRED" = "Handynummer ist erforderlich";
"MOBILE_NUMBER_INVALID" = "Handynummer ist ungültig";
"ENROLLMENT_WITH_SMS_HELP_LABEL" = "Bei dieser Karte ist ggf. eine Registrierung erforderlich. Bei Bedarf wird ein SMS-Code an diese Nummer gesendet.";
"SMS_CODE_REQUIRED" = "SMS-Code ist erforderlich";
"SMS_CODE_INVALID" = "SMS-Code ist ungültig";
"CANCEL_ACTION" = "Abbrechen";
"RETRY_ACTION" = "Wiederholen";
"CONTINUE_ACTION" = "Weiter";
"ADD_CARD_ACTION" = "Kreditkarte hinzufügen";
"DONE_ACTION" = "Fertig";
"EDIT_ACTION" = "Bearbeiten";
"NEXT_ACTION" = "Weiter";
"TOP_LEVEL_ERROR_ALERT_VIEW_OK_BUTTON_TEXT" = "OK";
"SCAN_CARD_IO_ACTION" = "Mit card.io einlesen";
"EDIT_PAYMENT_METHOD" = "Zahlungsquellen bearbeiten";
"THERE_WAS_AN_ERROR" = "Leider ist ein Fehler aufgetreten.";
"REVIEW_AND_TRY_AGAIN" = "Überprüfen Sie Ihre Angaben und versuchen Sie es erneut.";
"INVALID_LABEL" = "Ungültig:";
"YEAR_LABEL" = "Jahr";
"MONTH_LABEL" = "Monat";
"OTHER_LABEL" = "Sonstige";
"CREDIT_OR_DEBIT_CARD_LABEL" = "Kreditkarte";
"RECENT_LABEL" = "Zuletzt verwendet";
"SELECT_PAYMENT_LABEL" = "Zahlungsquelle auswählen";
"CONFIRM_ENROLLMENT_LABEL" = "Registrierung bestätigen";
"CONFIRM_ACTION" = "Bestätigen";
"ENTER_SMS_CODE_SENT_HELP_LABEL" = "Geben Sie den SMS-Code ein, der an %s gesendet wurde.";
"SMS_CODE_LABEL" = "SMS-Code";
"CARD_TYPE_GENERIC_CARD" = "Kreditkarte";
"MOBILE_COUNTRY_CODE_LABEL" = "Ländervorwahl";
"SECURITY_CODE_LABEL" = "Kartenprüfnummer";
"CVV_FIELD_PLACEHOLDER" = "CVV";
"CVC_FIELD_PLACEHOLDER" = "CVC";
"CID_FIELD_PLACEHOLDER" = "CID";
"CVN_FIELD_PLACEHOLDER" = "CVN";
"POSTAL_CODE_PLACEHOLDER" = "PLZ";
"MOBILE_NUMBER_LABEL" = "Handynummer";
"EXPIRATION_DATE_LABEL" = "Gültig bis";
"CARD_NUMBER_PLACEHOLDER" = "Kreditkartennummer";
"EXPIRY_PLACEHOLDER_FOUR_DIGIT_YEAR" = "MM/JJJJ";
"EXPIRY_PLACEHOLDER_TWO_DIGIT_YEAR" = "MM/JJ";
"PAYPAL" = "PayPal";
"CARD_TYPE_AMERICAN_EXPRESS" = "American Express";
"CARD_TYPE_DISCOVER" = "Discover";
"CARD_TYPE_DINERS_CLUB" = "Diners Club";
"CARD_TYPE_MASTER_CARD" = "MasterCard";
"CARD_TYPE_VISA" = "Visa";
"CARD_TYPE_JCB" = "JCB";
"CARD_TYPE_MAESTRO" = "Maestro";
"CARD_TYPE_UNION_PAY" = "UnionPay";
"BRANDING_COINBASE" = "Coinbase";
"BRANDING_VENMO" = "Venmo";
"BRANDING_APPLE_PAY" = "Apple Pay";
"BRANDING_ANDROID_PAY" = "Android Pay";
"USE_DIFFERENT_PHONE_NUMBER_ACTION" = "Andere Nummer verwenden";
"CARD_NOT_ACCEPTED_ERROR_LABEL" = "Karte nicht akzeptiert";
If you want to add a other language then "en" you have to add a new folder named "PUT YOUR LANGUAGE CODE HERE.lproj" (de_DE or other) to your Resources folder in your .iOS Project and add a new text file called "BTUI.strings" which contains a list of translations.
BTUI.strings