Configureable barcode format via bwp-js

public/env.sample.js

@@ -10,5 +10,6 @@ const config = {
 	// optional, will fallback to baseurl_selfservice/imprint
 	url_imprint: '',
 	// optional, will fallback to baseurl_selfservice/privacy
-	url_privacy: ''
+	url_privacy: '',
+	codeformat: 'code39'
 };