Strip GMail French quote header

Summary: Ref T8199. Add pattern matching for GMail French.

Test Plan:
  - Switched Gmail to french.
  - Replied to some mail.
  - Extracted quoted text header.
  - Added and executed unit test.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: tycho.tatitscheff, epriestley

Maniphest Tasks: T8199

Differential Revision: https://secure.phabricator.com/D12845

src/applications/metamta/parser/PhabricatorMetaMTAEmailBodyParser.php

@@ -123,6 +123,12 @@ final class PhabricatorMetaMTAEmailBodyParser {
       '',
       $body);
 
+    // French GMail quoted text. See T8199.
+    $body = preg_replace(
+      '/^\s*\d{4}-\d{2}-\d{2} \d+:\d+ GMT.*:.*?/imsU',
+      '',
+      $body);
+
     return rtrim($body);
   }
 

src/applications/metamta/parser/__tests__/PhabricatorMetaMTAEmailBodyParserTestCase.php

@@ -253,6 +253,13 @@ OKAY
 
 {$emdash}
 Sent from Mailbox
+EOMAIL
+,
+<<<EOMAIL
+OKAY
+
+2015-05-06 11:21 GMT-07:00 Someone <someone@somewhere.com>:
+> ...
 EOMAIL
     );
   }