Locales.getLocale("de_DE_dgl") returns a different locale than zk 8

Steps to Reproduce

1. call Locales.getLocale("de_DE_dgl")

Current Result

return a Locale: de_DE

Expected Result

return a Locale: de_DE_dgl in ZK 8.6.3

Debug Information

• the method's implementation changed for ZK-4745

Workaround

• wrap the API and return new Locale("de","DE","dgl");