make plugins translation work under windows.

src/gajim.py

@@ -156,6 +156,11 @@ common.configpaths.gajimpaths.init_profile(profile)
 del profile
 
 if os.name == 'nt':
+    plugins_locale_dir = str(os.path.join(common.configpaths.gajimpaths[
+        'PLUGINS_USER'], 'locale'))
+    libintl.bindtextdomain('gajim_plugins', plugins_locale_dir)
+    libintl.bind_textdomain_codeset('gajim_plugins', 'UTF-8')
+
     class MyStderr(object):
         _file = None
         _error = None

src/plugins/plugins_i18n.py

@@ -27,10 +27,12 @@ from common import gajim
 APP = 'gajim_plugins'
 plugins_locale_dir = os_path.join(gajim.PLUGINS_DIRS[1], 'locale')
 
-locale.setlocale(locale.LC_ALL, '')
-locale.bindtextdomain(APP, plugins_locale_dir)
-gettext.bindtextdomain(APP, plugins_locale_dir)
-gettext.textdomain(APP)
+if os.name != 'nt':
+    locale.setlocale(locale.LC_ALL, '')
+    locale.bindtextdomain(APP, plugins_locale_dir)
+    gettext.bindtextdomain(APP, plugins_locale_dir)
+    gettext.textdomain(APP)
+
 try:
     t = gettext.translation(APP, plugins_locale_dir)
     _ = t.gettext