Index: src/applications/repository/storage/PhabricatorRepository.php
===================================================================
--- src/applications/repository/storage/PhabricatorRepository.php
+++ src/applications/repository/storage/PhabricatorRepository.php
@@ -294,10 +294,10 @@
 
   private function getCommonCommandEnvironment() {
     $env = array(
-      // NOTE: Force the language to "C", which overrides locale settings.
-      // This makes stuff print in English instead of, e.g., French, so we can
-      // parse the output of some commands, error messages, etc.
-      'LANG' => 'C',
+      // NOTE: Force the language to "en_US.UTF-8", which overrides locale
+      // settings. This makes stuff print in English instead of, e.g., French,
+      // so we can parse the output of some commands, error messages, etc.
+      'LANG' => 'en_US.UTF-8',
 
       // Propagate PHABRICATOR_ENV explicitly. For discussion, see T4155.
       'PHABRICATOR_ENV' => PhabricatorEnv::getSelectedEnvironmentName(),