[NTG-context] How to setup german documents?

Hi all! I have a very basic question which occupies me for more than a week now: How to setup documents for german language properly, such that: 1. the used input encoding is ISO-8859-1, 2. german special character are available, and 3. german hyphenation patterns are used. The setup shown below does not work: TeX is not able to hyphenate "Änderungsabnahme" and the \quotedblbase symbol is broader than its counterpart the \quotedblleft symbol. Thanks for your attention and help, --Stefan \setupoutput[pdftex] \enableregime[il1] \usetypescript[times][ec] \mainlanguage[de] \starttext äÄöÖüÜß quotedblbase: \quotedblbase quotedblleft: \quotedblleft \showhyphens{Änderungsabnahme} \stoptext