Setting of Language via dct:language

[mborowski511]

Firstly:
We propose to offer the possibility to set the language via a DC Terms field,
e. g. "dct:language http://id.loc.gov/vocabulary/iso639-1/de ;" for German language.
In our project, we have mainly German labels.
We are irritated that the language tag is set to "en" by default.

Secondly:
If one choose another language, there seem to be no changes in the visualized ontology.
One would expect that only labels in the chosen language are presented, right?