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/status/thunderbolt.js

@@ -312,7 +312,7 @@ class Indicator extends SystemIndicator {
             this._notify(title, body);
         } else {
             const title = _('Unauthorized Thunderbolt device');
-            const body = _('New device has been detected and needs to be authorized by an administrator.');
+            const body = _('New device has been detected and needs to be authorized by an administrator');
             this._notify(title, body);
         }
     }