New stable release of xfce4-power-manager.

* Bugfixes:
 - plugin: Fix a couple memory leaks (Bug #12332)
 - Fix a crash when the brightness slider is released
 - Fix keyboard-brightness icon names (Bug #12292)
 - Draw border around device details
 - Add bitrig to backend detection (Bug #12242)
 - Replace XTestFakeKeyEvent with inhibit/heartbeat (Bug #11083)
   /xfce4-power-manager/heartbeat-command is the xfconf property.
 - Fix a crash on logout (Bug #12465)
 - Show inhibitors in the plugin menu (Bug #9090)

* Translation updates:
  ar, ca, cs, da, de, el, en_AU, eu, fi, fr, gl, he, hr,
  is, it, ja, kk, ko, lt, ms, nb, nl, oc, pl, pt, pt_BR,
  ru, sk, sl, sr, sv, th, tr, uk, zh_CN, and zh_TW