Feat: Create localized Strings class for the app

[jaivsh]

Describe the feature

The localized strings for the whole app are very helpful, as it they serve as the base for converting the app's language into another one, thus providing support within the application for multiple languages.

I'd add all the main strings used in the app to this class file, and would convert the source code of the relevant screens to make the text widgets show strings from this localized class, instead of the hardcoded one. This would make it easier to convert the app's language into another one in the future, and is also necessary for good coding standards.

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[jaivsh]

Hey @avinashkranjan please assign me this!