[Feature] i18n support

[dmvt]

User Story

• As an <audience/user>: user
• I want to <action/task>: see the site in my preferred language
• so that <outcome/goal/benefit>: it's easier to read

Type

• [X] Enhancement
• [ ] Maintenance
• [ ] Refactor

Description

We have a global user base. We should be friendly to them.

Solution

@nigeon has a great first pass at https://github.com/pie-dao/btc.piedao.org/pull/4. Unfortunately, the approach taken does not fully support the modular approach of @pie-dao packages. The translations are great, but the text object passed down through the React props (https://github.com/pie-dao/btc.piedao.org/blob/development/src/index.jsx#L54) should be maintained and configured by the i18n solution.

After reviewing the various options, I believe i18next is the right library to use (https://www.i18next.com/overview/getting-started). If you would prefer to use another, please discuss it in the comments on this issue.

Definition of Done

• [ ] the text object is generated by the i18next core library (not the react version)
• [ ] at least one language besides english is available
• [ ] a clear structure exists for adding other languages
• [ ] any static English text lingering in the templates is replaced by a key within the text object
• [ ] English is the fallback language

Attach files or screenshots if it's helpful for this issue.

[nigeon]

Is there any bounty program?