(dev/drupal/17) Add Drupal8 support for getUFLocale()

[monishdeb]

Overview

This makes it possible to support multilingual Drupal8. For example, if a site is available in both French and English, using prefix-based language detection in Drupal8, CiviCRM will automatically select the correct locale as well (i.e. "inheritLocale").

Drupal7 used global variables for language, whereas Drupal8 uses more clearly defined functions. Hence this was not clearly failing before.

To reproduce:

• Enable Drupal locale, bilingual site, enable multi-lingual in CiviCRM, add FR/EN.
• Create a public profile in CiviCRM
• Translate the profile field labels
• Access in French/English.

https://lab.civicrm.org/dev/drupal/issues/17

Before

The forms were always in the default site language.

After

The forms are in the language of the user.

[monishdeb]

ping @totten @mlutfy

[seamuslee001]

Changes seem to make sense to me but will await confirmation from @mlutfy but it seems a reasonable re-submit of his PR with a number of tidy ups

[mlutfy]

Looks good. I tested it in production, using our main use-cases (including the CiviCRM REST API endpoint), and seems all OK. Thanks @monishdeb !

(CiviCRM Review Template WORD-1.0)

• (r-test) we don't have d8 tests yet.
• (r-code) ✔
• (r-doc) n/a
• (r-maint) ✔ much cleaner
• (r-run) ✔ tested it in production, including the REST API endpoint.
• (r-user) n/a
• (r-tech) n/a