Feat: Give Preferred language based Credential Error from Backend

[Vishal2002]

Fixes #2860

Changes:

• Added i18next in the backend to automatically determine the language and map the correct error credential message.
• In the Nav.jsx component, a backend request is sent to the endpoint /getCurrentLanguage to store the current language. The language is then changed using i18n.changeLanguage(language);.
• Utilized i18nextMiddleware to capture the language and facilitate mapping errors accordingly.

I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #2860

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[lindapaiste]

This shows a lot of potential! Translating server-side messages is something that we've been discussing for a long time. See #1587

[perminder-17]

Looks good!

[Vishal2002]

This shows a lot of potential! Translating server-side messages is something that we've been discussing for a long time. See #1587

What to do next?

[PiyushChandra17]

Looks good 👍

[raclim]

Thanks so much for your work on this!

Due to some of the changes here falling out of date and some of the other features/fixes we'd like to prioritize over the next two months, I'm going to close this pull request for now. I'm really sorry that it took a while to get to this and that we couldn't get this in at the moment, but please feel free to update and reopen this pull request in the future!