[sddm-theme] Use more precise labels for "Different User"
Summary: The "Different User" action button label is wrong. The respective button switches to a screen where usernames are manually inputted. The patch proposes a better label and also renames the label in this manual input screen.
Reviewers: ngraham, Plasma, VDG, hein
Reviewed By: ngraham, Plasma, VDG, hein
Subscribers: rooty, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D18831