How to set language in Biber (1.6)?

How to set language in Biber (1.6)?

I am using biber to manage my bibliography. I am using MikTeX with all updates installed. After updating to 1.6 however, my language settings don't work. Despite setting German as prime language, the bibliography gets outputed in English. What changed? Or what did I do wrong.
Here is the MWE:
% test.tex

% !TEX TS-program = xelatex
% !TEX encoding =UTF-8 Unicode

\documentclass[a4paper,12pt,headings=small]{scrreprt}

\usepackage{polyglossia}
\setmainlanguage{german}


\usepackage[
backend=biber,
style=authoryear-icomp,
]{biblatex}
\bibliography{bibliographie.bib}

\begin{document}
\chapter{Einleitung}
Ich möchte \textcite{bannas2012} zitieren und bin gespannt auf das Ergebnis.

\printbibliography
\end{document}
With bibliography.bib:
% Encoding: UTF8

@ARTICLE{bannas2012,
  author = {Bannas, Günter},
  title = {Angela Merkel in Indonesien},
  year = {2012},
  month = jul,
  url = {http://www.faz.net},
  urldate = {2013-03-21},
}
Maybe, language related bibers log helps:
INFO - Decoding LaTeX character macros into UTF-8
INFO - Found BibTeX data source 'bibliographie.bib'
INFO - Overriding locale 'de_DE.UTF-8' default tailoring 'variable = shifted' with 'variable = non-ignorable'
INFO - Sorting 'entry' list 'nyt' keys
INFO - No sort tailoring available for locale 'de_DE.UTF-8'
INFO - Writing 'einstellungen.bbl' with encoding 'UTF-8'