Release 6.20.0: Added Czech and Hungarian translations for standard mail folder names

[changerequest]

The configuration file /opt/open-xchange/etc/admindaemon/User.properties will be extended with the following lines:

# Czech

SENT_MAILFOLDER_CS_CZ=Odeslan\u00e9 polo\u017eky
TRASH_MAILFOLDER_CS_CZ=Ko\u0161
DRAFTS_MAILFOLDER_CS_CZ=Koncepty
SPAM_MAILFOLDER_CS_CZ=Spam
CONFIRMED_SPAM_MAILFOLDER_CS_CZ=Potvrzen\u00fd spam
CONFIRMED_HAM_MAILFOLDER_CS_CZ=Potvrzen\u00e1 norm\u00e1ln\u00ed po\u0161ta

# Hungarian

SENT_MAILFOLDER_HU_HU=Elk\u00fcld\u00f6tt elemek
TRASH_MAILFOLDER_HU_HU=T\u00f6r\u00f6lt elemek
DRAFTS_MAILFOLDER_HU_HU=Piszkozatok
SPAM_MAILFOLDER_HU_HU=Lev\u00e9lszem\u00e9t
CONFIRMED_SPAM_MAILFOLDER_HU_HU=Elfogadott k\u00e9retlen
CONFIRMED_HAM_MAILFOLDER_HU_HU=Elfogadott \u00e1l-k\u00e9retlen