feat: save user preferences for language

[ajohn25]

Description

This PR allows Spoke users to:

1. Enter their language preference at signup (defaulting to English)
2. Edit their language preference from the user menu
3. See translated copy in their chosen language

Motivation and Context

Part of tackling #47

How Has This Been Tested?

This has been tested locally to confirm:

1. i18n language is only set on login/refresh (not when navigating between pages normally)
2. User language preferences are saved correctly during user signup or user edit
3. i18n maps selected languages to the correct translations

Screenshots (if appropriate):

Documentation Changes

Checklist:

• My change requires a change to the documentation.
• I have included updates for the documentation accordingly.

[boba1007]

The code looks good @ajohn25 , but I ran into this error when running locally: GraphQL error: Cannot return null for non-nullable field User.language - just logged in with an existing account.

[ajohn25]

The code looks good @ajohn25 , but I ran into this error when running locally: GraphQL error: Cannot return null for non-nullable field User.language - just logged in with an existing account.

Thanks for checking @boba1007 ! Any difference if you run migrations before trying to log in? yarn knex migrate:latest should do that

[boba1007]

Thanks for checking @boba1007 ! Any difference if you run migrations before trying to log in? yarn knex migrate:latest should do that

Ah, that does the trick! Retested and the language toggle works as expected on refresh or login for me. Thanks!

[ajohn25]

Thanks for checking @boba1007 ! Any difference if you run migrations before trying to log in? yarn knex migrate:latest should do that

Ah, that does the trick! Retested and the language toggle works as expected on refresh or login for me. Thanks!

Awesome! Migrations run automatically when we deploy to production but have to run manually on dev. Which reminds me i need to update the schema dump as well 😅