Use custom font for MessageTextView

gajim/message_textview.py

@@ -51,6 +51,7 @@ class MessageTextView(Gtk.TextView):
         self.set_right_margin(2)
         self.set_pixels_above_lines(2)
         self.set_pixels_below_lines(2)
+        self.get_style_context().add_class('font_custom')
 
         # set undo list
         self.undo_list = []