Issue #2662078 by lluvigne: Update the misleading warning message in Content Translation module

core/modules/content_translation/content_translation.install

@@ -21,7 +21,7 @@ function content_translation_enable() {
   // Translation works when at least two languages are added.
   if (count(\Drupal::languageManager()->getLanguages()) < 2) {
     $t_args = array(':language_url' => \Drupal::url('entity.configurable_language.collection'));
-    $message = t('Be sure to <a href=":language_url">add at least two languages</a> to translate content.', $t_args);
+    $message = t('This site has only a single language enabled. <a href=":language_url">Add at least one more language</a> in order to translate content.', $t_args);
     drupal_set_message($message, 'warning');
   }
   // Point the user to the content translation settings.