xfce4-panel-plugins: Fix display of alarm in certain locales

* make the add/edit dialog transient for the main
configuration window and to make the notification dialog
modal
* use a dynamically allocated string to hold timer data in
order to prevent truncation in some locales (bnc#742788)

Fixed bugs
bnc#742788
xfce4-timer add new alarm fail in ja_JP.UTF-8
Selected Binaries
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