Fix ambiguous "Current" label in energy information
Summary:
Replace the label text with "Current energy", to prevent confusion with electric current.
BUG: 410033
Reviewers: Plasma, VDG, broulik, filipf, ngraham
Reviewed By: VDG, filipf, ngraham
Subscribers: aspotashev, ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D22783