Feat: Implement i18n support for multi-language accessibility

[AM-officials]

Describe the feature

Is there an existing issue for this?

• I have searched the existing issues

What happened?
Lack of Internationalization (i18n) Support
The application currently uses hardcoded English strings throughout the frontend codebase. This prevents the interface from being translated into other languages, limiting accessibility for non-English users and blocking global community contributions.

File: frontend/src (General)

Step Action

Step	Action
1	Open the PictoPy source code (e.g., LeftSidebar.tsx or Settings.tsx).
2	Locate UI elements like buttons or labels.
3	Result: Observe that text is hardcoded (e.g., <button>Save</button>) instead of using translation keys (e.g., {t('save')}).
4	Open the PictoPy application and go to Settings.
5	Result: There is no option to switch the interface language.

Suggested Solution
Integrate a library like i18next and react-i18next. Extract hardcoded strings into locale files (e.g., en.json) to allow the community to submit translations for other languages.

Record

• I agree to follow this project's Code of Conduct

Add ScreenShots

Record

• I agree to follow this project's Code of Conduct
• I want to work on this issue

[github-actions]

👋 Thanks for opening this issue! The maintainers will review it shortly. Till then, do not open any PR. This is a strict rule we like to follow around here :)

[AM-officials]

@rahulharpal1603 Hi sir, I would like to work on this issue, please assign this to me.