Issue #2569295 by geertvd, lauriii: Replace remaining !placeholder for Non-URL...

Issue #2569295 by geertvd, lauriii: Replace remaining !placeholder for Non-URL HTML outputs only in #title lines

core/modules/config_translation/src/FormElement/FormElementBase.php

@@ -100,9 +100,9 @@ protected function getSourceElement(LanguageInterface $source_language, $source_
 
     return array(
       '#type' => 'item',
-      '#title' => $this->t('@label <span class="visually-hidden">(!source_language)</span>', array(
+      '#title' => $this->t('@label <span class="visually-hidden">(@source_language)</span>', array(
         '@label' => $this->definition->getLabel(),
-        '!source_language' => $source_language->getName(),
+        '@source_language' => $source_language->getName(),
       )),
       '#markup' => $value,
     );
@@ -162,9 +162,9 @@ protected function getSourceElement(LanguageInterface $source_language, $source_
   protected function getTranslationElement(LanguageInterface $translation_language, $source_config, $translation_config) {
     // Add basic properties that apply to all form elements.
     return array(
-      '#title' => $this->t('@label <span class="visually-hidden">(!source_language)</span>', array(
+      '#title' => $this->t('@label <span class="visually-hidden">(@source_language)</span>', array(
         '@label' => $this->definition['label'],
-        '!source_language' => $translation_language->getName(),
+        '@source_language' => $translation_language->getName(),
       )),
       '#default_value' => $translation_config,
       '#attributes' => array('lang' => $translation_language->getId()),