Fixed deprecated warnings with python3-gobject 3.13.3.

python3-gobject adds several warnings in gi/overrides/Gtk.py

/usr/share/ibus-anthy/setup/main.py:1519: PyGTKDeprecationWarning:
The "buttons" argument must be a Gtk.ButtonsType enum value. Please
use the "add_buttons" method for adding buttons.
See: https://wiki.gnome.org/PyGObject/InitializerDeprecations

/usr/lib64/python3.4/site-packages/gi/overrides/Gtk.py:537:
PyGTKDeprecationWarning: The keyword(s) "parent" have been deprecated
in favor of "transient_for" respectively.
See: https://wiki.gnome.org/PyGObject/InitializerDeprecations
Added another status icon for input mode.
Updated translations.
Fix to unref pixbuf when propery icon is unrefed.
Fix None object has clear() in input mode icon. (#1097364)