[FEATURE] - Implement Multiple Language Support for UI and Templates

[al1abb]

Description:

Issue: Implementing multiple language support (internationalization or i18n) for the invoice generation app to enhance accessibility for a global audience. This includes translations for both the website's user interface (UI) and the templates used for generating invoices.

Goals:

• Allow users to switch between supported languages.
• Present content and user interface elements in the user's selected language.
• Use a localization library to manage translations effectively for both UI and templates.
• Ensure a seamless user experience regardless of the chosen language.

Tasks:

UI Translations:

1. Identify Supported Languages for UI:

   • [x] Determine the list of languages to support for the website's user interface.

2. Choose a Localization Library for UI:

   • [x] Evaluate and select a suitable localization library for Next.js, such as next-i18next, to handle UI translations.

3. Create UI Translation Files:

   • [x] Create separate translation files for each supported language for the website's UI (e.g., en.json, es.json, fr.json).

4. Integrate UI Translations:

   • [ ] Replace hardcoded UI text with references to translation keys throughout the website.
   • [x] Implement the t function from the chosen localization library to handle UI translations.

5. Load UI Translations Dynamically:

   • [x] Set up dynamic loading of UI translation files based on the user's language preference.

6. Language Selector for UI:

   • [x] Add a language selector in the app's settings or user profile page to allow users to change their preferred UI language.

Template Translations:

7. Identify Supported Languages for Templates:

   • [ ] Determine the list of languages to support invoice templates.

8. Create Template Translation Files:

   • [ ] Create separate translation files for each supported language for template content.

9. Integrate Template Translations:

   • [ ] Implement a system to apply template translations dynamically when generating invoices.

10. Testing and Localization Management:

    • [ ] Thoroughly test UI and templates in different languages to ensure the content fits within UI elements and templates.

11. Regular Updates:

    • [ ] Establish a process to keep UI and template translations up-to-date as the app evolves.
    • [ ] Plan for adding new translations as needed for additional languages.

Additional Information:

• The goal is to provide a user-friendly experience for a global audience for both UI and generated invoices.
• This feature enhances the accessibility and usability of the app.