Make the web UI translatable

[Odovren]

Summary

Hi y'all 👋

I'm new here, but I would like to propose (and could work on a PR for it) that the door is open to multilingual UI on Lenstube.

Even though I suppose it's not the top priority of the platform, I noticed that currently having multiple locales is not implemented.
I know that it's usually disregarded in Web3 in general, but I do believe that being english only for a platform is one of the obstructors for mass adoption.

It would also be a good first PR for me on this project, but I wanted to have your opinion before working on it.

The proposal for the first PR would be the following:

• Add the i18n handling for Next
• Turn all literal string in the UI to a translatable string
• Make en-US (or en-GB, to be discussed I guess) the default locale
• Extract all translatable strings in a en locale file

This way, it would not change the current UI, but it would prepare the project for multiple languages to be added in the future.

Let me know if there is an interest for this kind of feature!

[sasicodes]

We can implement for sure - #465

[sasicodes]

Potential service - @crowdin

[sasicodes]

We started with es and gradually l10n will be done!