add confirmation dialog for clearing groups and streaming settings

web/public/locales/en/common.json

@@ -131,6 +131,7 @@
     "close": "Close",
     "expand": "Expand",
     "collapse": "Collapse",
+    "clear": "Clear",
     "copy": "Copy",
     "copiedToClipboard": "Copied to clipboard",
     "back": "Back",

web/public/locales/en/views/settings.json

@@ -180,12 +180,14 @@
     "storedLayouts": {
       "title": "Stored Layouts",
       "desc": "The layout of cameras in a camera group can be dragged/resized. The positions are stored in your browser's local storage.",
-      "clearAll": "Clear All Layouts"
+      "clearAll": "Clear All Layouts",
+      "clearConfirm": "This will clear the stored layout for every camera group in this browser. This cannot be undone."
     },
     "cameraGroupStreaming": {
       "title": "Camera Group Streaming Settings",
       "desc": "Streaming settings for each camera group are stored in your browser's local storage.",
-      "clearAll": "Clear All Streaming Settings"
+      "clearAll": "Clear All Streaming Settings",
+      "clearConfirm": "This will clear the streaming settings for every camera group in this browser. This cannot be undone."
     },
     "backupRestore": {
       "title": "Backup & Restore",