Log Message:
Update ibus-kkc to 1.5.21.

    Drop support for libkkc <= 0.3.3

    setup: Check if the existing shortcut key is non-null, when removing

    setup: Set the "label" attribute properly when adding a shortcut

    Port to libgee 0.8 API

    Don't send update-property signal until properties are registered
    To reduce the number of D-Bus signals sent on focus-in.

    Update translations