PLT-4853 Adding cache purging to the server (server) (#4735)

* PLT-4853 Adding caching invalidation to HA

* PLT-4853 Adding cach purging to the server

i18n/en.json

@@ -683,6 +683,10 @@
     "id": "api.context.invalid_token.error",
     "translation": "Invalid session token=%v, err=%v"
   },
+  {
+    "id": "api.context.invalidate_all_caches",
+    "translation": "Purging all caches"
+  },
   {
     "id": "api.context.last_activity_at.error",
     "translation": "Failed to update LastActivityAt for user_id=%v and session_id=%v, err=%v"