Use correct i18n module

message_box_size/manifest.ini

@@ -1,7 +1,7 @@
 [info]
 name: Message Box Size
 short_name: message_box_size
-version: 1.2.0
+version: 1.2.1
 description: Allows you to adjust the height of the new message input field.
 authors: Denis Fomin <fominde@gmail.com>
 homepage: http://trac-plugins.gajim.org/wiki/MessageBoxSizePlugin

message_box_size/msg_box_size.py

@@ -3,12 +3,7 @@ from gi.repository import Gtk
 from gajim.plugins import GajimPlugin
 from gajim.plugins.helpers import log_calls
 from gajim.plugins.gui import GajimPluginConfigDialog
-
-# Since Gajim 1.1.0 _() has to be imported
-try:
-    from gajim.common.i18n import _
-except ImportError:
-    pass
+from gajim.plugins.plugins_i18n import _
 
 
 class MsgBoxSizePlugin(GajimPlugin):