Fix display and translation of vocabulary values.
Compare the result of at_utils.translate call in these tests.

It is nice to know that the call does not raise an exception, but we
want a correct answer too.
Fix translating integer display lists.

Refs pull request #25.
Test that translating unicode values from vocabs goes right.

No longer use the unicodeEncode python skin script here, as the part we need is really simple.
changelog entry for last change