general: Remove periods from single sentences

This is done to align with the HIG rule about periods in single sentence
strings.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3280>

js/ui/main.js

@@ -387,7 +387,7 @@ async function _handleLockScreenWarning() {
 
         notify(
             _('Screen Lock disabled'),
-            _('Screen Locking requires the GNOME display manager.'));
+            _('Screen Locking requires the GNOME display manager'));
     }
 }