Merge pull request #885 from nlegoff/fix-1668

[3.8] Fix #1668 Add gettext extension as system requirement

lib/Alchemy/Phrasea/Setup/Requirements/SystemRequirements.php

@@ -208,6 +208,12 @@ class SystemRequirements extends RequirementCollection implements RequirementInt
             'Install and enable the <strong>curl</strong> extension.'
         );
 
+        $this->addRequirement(
+            function_exists('gettext'),
+            'gettext extension is required',
+            'Install and enable the <strong>gettext</strong> extension.'
+        );
+
         $this->addRequirement(
             function_exists('gd_info'),
             'gd extension is required',