How to get translated field using Twig tweak? I use twig tweak for rendering username on site this way:

username.html.twig:

{#
/**
 * @file
 * Theme override for displaying a username.
 *
 * Available variables:
 * - account: The full account information for the user.
 * - uid: The user ID, or zero if not a user. As used in anonymous comments.
 * - name: The user's name, sanitized, and optionally truncated.
 * - name_raw: The user's name, un-truncated.
 * - truncated: Whether the user's name was truncated.
 * - extra: Additional text to append to the user's name, sanitized.
 * - profile_access: Whether the current user has permission to access this
     users profile page.
 * - link_path: The path or URL of the user's profile page, home page,
 *   or other desired page to link to for more information about the user.
 * - homepage: (optional) The home page of the account, only set for non users.
 * - link_options: Options to set on the \Drupal\Core\Url object if linking the
 *   user's name to the user's page.
 * - attributes: HTML attributes for the containing element.
 *
 * @see template_preprocess_username()
 */
#}    
{% if link_path -%}
  &lt;a{{ attributes }}&gt;{{ drupal_field('field_name', 'user', uid) }}{{ extra }}&lt;/a&gt;
{%- else -%}
  &lt;span{{ attributes }}&gt;{{ drupal_field('field_name', 'user', uid) }}{{ extra }}&lt;/span&gt;
{%- endif -%}


But this doesn't work with translation. How to get translated field? 

4k4 answer this way: 

{{ drupal_field('field_name', 'user', uid, user.langcode.value) }}


But I don't need language from session/url, not from user settings
Try the language parameter:

{{ drupal_field('field_name', 'user', uid, user.langcode.value) }}


This was added to drupal_field() in this issue Support drupal_field translatability.

For this to work the user entity needs to be available in your template.