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diff --git a/Mailman/interfaces/languages.py b/Mailman/interfaces/languages.py
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+++ b/Mailman/interfaces/languages.py
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+# Copyright (C) 2007 by the Free Software Foundation, Inc.
+#
+# This program 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 2
+# of the License, or (at your option) any later version.
+#
+# This program 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 this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+"""Interfaces for managing languages."""
+
+from zope.interface import Interface, Attribute
+
+
+
+class ILanguageManager(Interface):
+    """A language manager.
+
+    Current, disabling languages is not supported.
+    """
+
+    def add_language(code, description, charset, enable=True):
+        """Teach the language manager about a language.
+
+        :param code: The short two-character language code for the
+            language.  If the language manager already knows about this code,
+            the old language binding is lost.
+        :param description: The English description of the language,
+            e.g. 'English' or 'French'.
+        :param charset: The character set that the language uses,
+            e.g. 'us-ascii', 'iso-8859-1', or 'utf-8'
+        :param enable: Enable the language at the same time.
+        """
+
+    def enable_language(code):
+        """Enable a language that the manager already knows about.
+
+        :raises KeyError: when the manager does not know about the given
+            language code.
+        """
+
+    def get_language_data(code):
+        """Return the description and charset for the given `code`.
+
+        :param code: The code to lookup.
+        :returns: A 2-tuple of the description and charset for the code.
+        :raises KeyError: when the code is unknown.
+        """
+
+    known_codes = Attribute(
+        """An iterator over all known codes.""")
+
+    enabled_codes = Attribute(
+        """An iterator over all enabled codes.""")
+
+    enabled_names = Attribute(
+        """An iterator over all enabled language names.""")