Hi Ranadyuti Sarkar
Please have a look at the link :-https://docs.adobe.com/docs/en/aem/6-0/develop/components/i18n/translator.html
In this article there is a note that we need to keep in consideration.
NOTE
When using Dispatcher, you need to invalidate cached pages to include new dictionary strings in rendered component strings.
This article also covers "using translator to manage dictionaries"
I hope this might help you.
Thanks and Regards
Kautuk Sahni
Kautuk Sahni