feat: Add support for dictionary and use in Welcome page

[iamsushantk]

Description

Currently constants are spread all over the codebase.

However, going forward it would be a challenge to maintain these values.

Having dictionary would yield following benefits:

• All constants used in UI layer are housed together.
• These values can be reused at multiple places in the application thereby reducing duplication and enhancing consistency.
• Ability to add languages other than English en when needed.
• Ability to switch languages can be controlled via Preferences.
• Refactoring is easy as you need to make change only at one place.

I have used Welcome page to demonstrate its usage.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

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