Feat: Setting up app_localizations for multiple languages

[jaivsh]

Describe the feature

I'd implement the app's support for multiple languages by adding the app localizations for the application. This can be done by the flutter's own flutter_localizations plugin, which offers translations of app's strings into various languages of the world.
Through implementing localizations, it would be possible to convert app's strings into several other languages.

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[jaivsh]

@avinashkranjan please assign me this!