core: i18n refactoring:

- _() is no more installed in __builtin__
    - instead, there is a new sat.core.i18n module
    - added D_() method for deferred translation
    - languageSwitch method allow to dynamically change translation language
    - import gettext is tested against ImportError, and dummy methods are used when not available (mainly useful for Libervia)

src/bridge/bridge_constructor/dbus_frontend_template.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from bridge_frontend import BridgeFrontend
 import dbus
 from logging import debug, error

src/core/i18n.py

@@ -0,0 +1,42 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# SAT: a jabber client
+# Copyright (C) 2009, 2010, 2011, 2012, 2013  Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+try:
+
+    import gettext
+
+    _ = gettext.translation('sat', 'i18n', fallback=True).ugettext
+    _translators = {None: gettext.NullTranslations()}
+
+    def languageSwitch(lang=None):
+        if not lang in _translators:
+            _translators[lang] = gettext.translation('sat', languages=[lang], fallback=True)
+        _translators[lang].install(unicode=True)
+
+except ImportError:
+
+    print "WARNING: gettext support disabled"
+    _ = lambda msg: msg # Libervia doesn't support gettext
+    def languageSwitch(lang=None):
+        pass
+
+
+D_ = lambda msg: msg # used for deferred translations
+

src/core/sat_main.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from twisted.application import service
 from twisted.internet import defer
 

src/core/xmpp.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from twisted.internet import task, defer
 from twisted.words.protocols.jabber import jid, xmlstream
 from wokkel import client, disco, xmppim, generic, compat, delay, iwokkel

src/memory/memory.py

@@ -18,6 +18,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import with_statement
+from sat.core.i18n import _
 
 import os.path
 import csv

src/memory/persistent.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 
 

src/memory/sqlite.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.enterprise import adbapi
 from twisted.internet import defer

src/plugins/deprecated_misc_cs.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.xish import domish
 from twisted.internet import protocol, defer, threads, reactor

src/plugins/plugin_exp_command_export.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.protocols.jabber import jid
 from twisted.internet import reactor, protocol

src/plugins/plugin_exp_parrot.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.protocols.jabber import jid
 

src/plugins/plugin_exp_pipe.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.xish import domish
 from twisted.words.protocols.jabber import jid

src/plugins/plugin_misc_account.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from sat.core import exceptions
 from twisted.internet import reactor, defer, protocol

src/plugins/plugin_misc_groupblog.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.internet import defer
 from twisted.words.protocols.jabber import jid

src/plugins/plugin_misc_imap.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, error
 import warnings
 from twisted.internet import protocol, defer

src/plugins/plugin_misc_maildir.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, error
 import warnings
 warnings.filterwarnings('ignore', 'the MimeWriter', DeprecationWarning, 'twisted')  # FIXME: to be removed, see http://twistedmatrix.com/trac/ticket/4038

src/plugins/plugin_misc_quiz.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.xish import domish
 from twisted.internet import protocol, defer, threads, reactor

src/plugins/plugin_misc_radiocol.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.xish import domish
 from twisted.internet import reactor

src/plugins/plugin_misc_room_game.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, warning, error
 from twisted.words.protocols.jabber.jid import JID
 from twisted.words.xish import domish

src/plugins/plugin_misc_smtp.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, error
 import warnings
 from twisted.internet import protocol, defer

src/plugins/plugin_misc_tarot.py

@@ -17,6 +17,7 @@
 # You should have received a copy of the GNU Affero General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+from sat.core.i18n import _
 from logging import debug, info, warning, error
 from twisted.words.xish import domish
 from twisted.words.protocols.jabber import jid