Why would placeholders not be replaced?

For example, in the Uninstall page for modules, it shows the following.


It happens under the revisions tab as well.


  • 2
    I don’t think this is Twig related? – Kevin Dec 14 '18 at 23:56
  • 1
    Looks like the t() function in your Drupal is not replacing the placeholder values for some reason. – No Sssweat Dec 15 '18 at 4:25
  • 1
    Apparently the cause is the [github.com/drupal-pattern-lab/unified-twig-extensions/blob/… unified twig extensions module. Still not sure how it is messing the t() function up exactly. – electrokate Dec 16 '18 at 16:48
  • 1
    My guess is it might come with a dummy function that mocks t() and returns it for theming purposes? It could be overriding. – Kevin Dec 17 '18 at 4:12
  • @Kevin you were right, thank you for this insight! – electrokate Dec 18 '18 at 20:30

It looks like electrokate installed a Pattern Lab starter theme for Drupal that has a mock of the t() function that acts as a placeholder for prototyping the front end layer. It only returns the input it was sent, so it "works" under Pattern Lab - but running it inside of Drupal will cause this issue.

 * @file
 * Drupal translate filter.
$filter = new Twig_SimpleFilter('t', function ($string) {
  return $string;

This is meant to aid in making a Pattern Lab prototype outside of Drupal, but taking advantage of functions you will expect to use inside of Drupal so it is "Drupal ready".

edit: I may have linked to the wrong starter theme, but I can’t navigate it on mobile.

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