Menu bar fix and translation updates

A small follow-up to 1.0.

Fixed

Menu bar charging watts now clears when you unplug. If you had the
"Show charging watts in the menu bar" option on, the wattage could stay
on screen after you pulled the charger, showing a figure that no longer
applied. It now drops within about a second of unplugging. Thanks to the
Pro user who spotted it and confirmed the details.