Make Your Theme Translatable for Drupal 8, 9, and 10

In order to ensure that all user interface strings in your application can be translated using Drupal's localization system, any text you add to templates needs to use either the t filter or the {% trans %} tag. Anyone creating themes or editing template files associated with a theme or a module should know how to use these two utilities.

In this tutorial we'll look at:

  • How to use the t filter and {% trans %} tag in a Twig template
  • The differences between the two, and how to determine which one to use
  • How to translate strings assigned to variables in preprocess functions using the PHP t() function