This is a regular patch release, which includes many bugfixes but no feature enhancements over the previous release. It is fully backwards compatible to qooxdoo 1.6. Nothing needs to be changed in the JavaScript code of your existing apps if they are based on the previous 1.6 release.
See the corresponding bugzilla query for more than 110 issues resolved for qooxdoo 1.6.1.
no
has been removed from the CLDR data. Please use nb
("Norwegian Bokmål", which "no" used to redirect to) or nn
("Norwegian Nynorsk") instead. "NO" as territory code is ok (as in "nb_NO").