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I am using contextual filters on the /path/langcode view, where langcode is a contextual filter. How can I get langcode in a template file?

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You can get the contextual filter argument from the route match:

  $variables['arg_0'] = \Drupal::routeMatch()->getParameter('arg_0');

Usually the route parameters of contextual filters are named arg_0, arg_1 etc. If it doesn't work, check the route definition of this View page with Devel (/devel/routes) or Drupal Console.

Dependent on the Twig template you might need to add a cache context as well:

  $variables['#cache']['contexts'][] = 'route';

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