Issue #2838095 by cilefen, pjcdawkins: Only one site slogan character in site...

Issue #2838095 by cilefen, pjcdawkins: Only one site slogan character in site slogan when using PHP 7.1

core/modules/system/system.module

@@ -827,7 +827,9 @@ function system_preprocess_block(&$variables) {
       }
       $variables['site_slogan'] = '';
       if ($variables['content']['site_slogan']['#access'] && $variables['content']['site_slogan']['#markup']) {
-        $variables['site_slogan']['#markup'] = $variables['content']['site_slogan']['#markup'];
+        $variables['site_slogan'] = [
+          '#markup' => $variables['content']['site_slogan']['#markup'],
+        ];
       }
       break;