feat: Add a loader till the dashboard app is loaded (#5814)

Co-authored-by: Pranav Raj S <pranav@chatwoot.com>
Co-authored-by: Sivin Varghese <64252451+iamsivin@users.noreply.github.com>

app/javascript/dashboard/i18n/locale/en/generalSettings.json

@@ -48,7 +48,7 @@
       }
     },
     "UPDATE_CHATWOOT": "An update %{latestChatwootVersion} for Chatwoot is available. Please update your instance.",
-    "LEARN_MORE":"Learn more"
+    "LEARN_MORE": "Learn more"
   },
   "FORMS": {
     "MULTISELECT": {
@@ -122,7 +122,6 @@
       "GO_TO_SETTINGS_ACCOUNT": "Go to Account Settings",
       "GO_TO_SETTINGS_PROFILE": "Go to Profile Settings",
       "GO_TO_NOTIFICATIONS": "Go to Notifications",
-
       "ADD_LABELS_TO_CONVERSATION": "Add label to the conversation",
       "ASSIGN_AN_AGENT": "Assign an agent",
       "ASSIGN_A_TEAM": "Assign a team",
@@ -137,5 +136,8 @@
       "UNTIL_NEXT_WEEK": "Until next week",
       "UNTIL_TOMORROW": "Until tomorrow"
     }
+  },
+  "DASHBOARD_APPS": {
+    "LOADING_MESSAGE": "Loading Dashboard App..."
   }
 }