panel menu: Update bluetooth states messages;

Mariana Pícolorequested to merge
mariana.picolo/gnome-shell:2340-panel-menu-bluetooth into master

PanelMenu Bluetooth status text just says "On", should say "Bluetooth On" #2340 (closed)

  • "Bluetooth on/off";
  • Display single connected device name;

Fixes #2340 (closed)

Edited by Mariana Pícolo

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