* Add more generated text to the automatic translation.

* Remove all locale-dependent text from sphinx.sty, put it into Python files
  to enable message extraction and translation.
* Use babel in the LaTeX output.
* Centralize locations for labels used in every builder.

tests/test_i18n.py

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+"""
+    test_i18n
+    ~~~~~~~~~
+
+    Test locale features.
+
+    :copyright: 2008 by Georg Brandl.
+    :license: BSD.
+"""
+
+from util import *
+
+
+@with_testapp(confoverrides={'language': 'de'})
+def test_i18n(app):
+    app.builder.build_all()