translate all modules in the plugin dir(whiteboard plugin for example. translate plugin.py and whiteboard_widget.py)

plugins/whiteboard/plugin.py

@@ -120,11 +120,12 @@ class WhiteboardPlugin(GajimPlugin):
                 if control.contact.supports(NS_JINGLE_SXE) and \
                 control.contact.supports(NS_SXE):
                     base.button.set_sensitive(True)
-                    base.button.set_tooltip_text(_('Show whiteboard'))
+                    tooltip_text = _('Show whiteboard')
                 else:
                     base.button.set_sensitive(False)
-                    base.button.set_tooltip_text(_('Client on the other side '
-                        'does not support the whiteboard'))
+                    tooltip_text = _('Client on the other side '
+                        'does not support the whiteboard')
+                base.button.set_tooltip_text(tooltip_text)
 
     @log_calls('WhiteboardPlugin')
     def show_request_dialog(self, account, fjid, jid, sid, content_types):

src/plugins/pluginmanager.py

@@ -461,12 +461,10 @@ class PluginManager(object):
                     conf.remove_section('info')
 
                     plugins_found.append(module_attr)
-                    # set plugin localization
-                    plugin_module = dir(module)[-1]
-                    getattr(module, plugin_module)._ = _
 
                 except TypeError, type_error:
-                    pass
+                    # set plugin localization
+                    module_attr._ = _
                 except ConfigParser.NoOptionError, type_error:
                     # all fields are required
                     log.debug('%s : %s' % (module_attr_name,