[Kicker, Kickoff & Dash] Change labels to match SDDM theme labels

Summary: This patch follows patch D19458 and applies the same label changes to Kicker/Kickoff/Dash.

Reviewers: #vdg, ngraham

Reviewed By: #vdg, ngraham

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D19459

systementry.cpp

@@ -166,7 +166,7 @@ QString SystemEntry::name() const
             return i18n("Lock");
             break;
         case LogoutSession:
-            return i18n("Logout");
+            return i18n("Log Out");
             break;
         case SaveSession:
             return i18n("Save Session");
@@ -181,7 +181,7 @@ QString SystemEntry::name() const
             return i18n("Hibernate");
             break;
         case Reboot:
-            return i18n("Reboot");
+            return i18n("Restart");
             break;
         case Shutdown:
             return i18n("Shut Down");