Gutenboarding: i18n for new users

[razvanpapadopol]

When a non logged-in user is going through Gutenboarding we should use the browser language to handle i18n and also suggest an alternate language based on different variables (eg: location, campaign code, other tracking info, etc). locale passed in the URL

Actions:

• detect browser language (see an experimental PR that introduce this) and possibly extract this as a reusable utility
• define how to set an alternate locale to suggest to the user
• [ ] display locale suggestions like in the current signup

Locale detection is already done in the landing page #38909 (comment)

[simison]

We might actually get away with just having language as URL parameter, much like current /start flow does. I elaborated more in the master issue: #37665

[akirk]

I'd think it's favorable to keep it the current way. Language selection is harder than it appears and we've got a flow established that works. See also my comment on https://github.com/Automattic/wp-calypso/pull/37756/files#r373471313

[simison]

I'd think it's favorable to keep it the current way.

Yep, I agree and I wrote to that effect in master issue.

Just for clarity, I'll quote you also here from your PR comment:

Traditionally the detection is done on the landing page https://wordpress.com/ that might redirect to localized landing pages which then link to the onboarding with the language as a parameter (e.g. https://wordpress.com/start/fr). We then use the LocaleSuggestions class to offer a switch into the right language.

[simison]

...so basically todo for this issue: we need that kind of language fragments (e.g. /gutenboarding/fr/) and setting UI language to those from the beginning of the flow.

[sirreal]

Do we need to support language route parts, or subdomains? es.calypso.localhost:3000/gutenboarding seems to work out of the box with #39282.

[simison]

Do we need to support language route parts, or subdomains?
es.calypso.localhost:3000/gutenboarding seems to work out of the box with #39282.

@akirk do you know answer to this?

[akirk]

@sirreal How is the language set for logged-out users?

[sirreal]

Ignore my question, we won't go with subdomains here.

[sirreal]

With #39571, we now use the locale slug from the URL path to localize gutenboarding.