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In a Drupal 8/9 site, I can select the User's preferred language.

In the "Manage form display" page (for user's fields), there are two rows which are about language:

  • Language settings (settings = --no settings available--)
  • Language code (settings = "language select" as the only option)

Question 1 : What do these two options produce?

In the "Manage display" page, I can display only one item about the language : Language code

As a result, if I visit my user profile page, I can see:

Language code: French

But if I change my preferred language in my user edit profile page into Dutch, there is no effect in my "User view" page: it is always "French"

ok, I can preprocess something and adapt the twig template to display my preferred language but this is not the answer I would like to have.

Question 2: I would like to understand this behavior because, as always in Drupal, I am sure there is a good reason for that.

1 Answer 1

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I think I could answer myself to most of my questions:

1-The Language code field store the initial language of a user... it looks like it can't be changed after all. For my use case, it is an useless field.

2-The Language settings options display the Preferred language widget and the Administration pages language widget. I think that this last widget is there only if you check Account administration pages language setting. in admin/config/regional/language/detection

3-The most important part: How to display the preferred language of a user in the the display user page (/user/xxx)

You can do it with this hook:

function mymodule_entity_base_field_info_alter(&$fields, EntityTypeInterface $entity_type) {
  if ($entity_type->id() == "user") {
    $fields['preferred_langcode']->setDisplayConfigurable('view', TRUE);
  }
}

I really don't know why it is not a default... (don't hesitate to add any information on this point)

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