migrate to bwip-js

public/env.sample.js

@@ -7,6 +7,8 @@ const config = {
 	baseurl_selfservice: '/selfservice/',
 	// full url (including fqdn)
 	baseurl_documentserver: 'http://localhost:4010/documents',
+	// optional, will fallback to code128
+	code_format: 'ean13',
 	// optional, will fallback to baseurl_selfservice/imprint
 	url_imprint: '',
 	// optional, will fallback to baseurl_selfservice/privacy