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diff --git a/src/mailman/languages/manager.py b/src/mailman/languages/manager.py
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+# Copyright (C) 2007-2009 by the Free Software Foundation, Inc.
+#
+# This file is part of GNU Mailman.
+#
+# GNU Mailman is free software: you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation, either version 3 of the License, or (at your option)
+# any later version.
+#
+# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+# more details.
+#
+# You should have received a copy of the GNU General Public License along with
+# GNU Mailman.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Language manager."""
+
+from __future__ import absolute_import, unicode_literals
+
+__metaclass__ = type
+__all__ = [
+    'LanguageManager',
+    ]
+
+from zope.interface import implements
+
+from mailman.interfaces.languages import ILanguageManager
+from mailman.languages.language import Language
+
+
+
+class LanguageManager:
+    """Language manager."""
+
+    implements(ILanguageManager)
+
+    def __init__(self):
+        # Mapping from 2-letter code to Language instance.
+        self._languages = {}
+
+    def add_language(self, code, charset, description):
+        """See `ILanguageManager`."""
+        if code in self._languages:
+            raise ValueError('Language code already registered: ' + code)
+        language = Language(code, charset, description)
+        self._languages[code] = language
+
+    @property
+    def codes(self):
+        """See `ILanguageManager`."""
+        return iter(self._languages)
+
+    @property
+    def languages(self):
+        """See `ILanguageManager`."""
+        return iter(self._languages.values())
+
+    def get(self, code, default=None):
+        """See `ILanguageManager`."""
+        return self._languages.get(code, default)
+
+    def __getitem__(self, code):
+        """See `ILanguageManager`."""
+        return self._languages[code]
+
+    def __contains__(self, code):
+        """See `ILanguageManager`."""
+        return code in self._languages