1
To have the "Translate" tab listed on your module's configuration page you additionally need to provide a module_name.config_translation.yml in your module's root.
module_name.settings:
title: 'Module Name'
base_route_name: module_name.admin_settings
names:
- module_name.settings
Look for existing module_name.config_translation.yml file in core ...
1
In page.html.twig and Drupal 8.7.6, I had to use:
{% if language.id == 'en' %} or {{ language.id == 'en' ? 'active' : 'not-active' }}
Other suggestions did not work.
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