Review labels widget (#22664)

* add review labels widget

* register widget and add to review section

* i18n

* add border to switches widget

* padding tweaks

* don't show audio labels if audio is not enabled

* add docs links

* ability to add custom labels to review

* add hint for empty selection in review labels and SwitchesWidget

* language consistency

web/public/locales/en/config/cameras.json

@@ -529,7 +529,7 @@
     },
     "detections": {
       "label": "Detections config",
-      "description": "Settings for creating detection events (non-alert) and how long to keep them.",
+      "description": "Settings for which tracked objects generate detections (non-alert) and how detections are retained.",
       "enabled": {
         "label": "Enable detections",
         "description": "Enable or disable detection events for this camera."