Do not clean LANG environment variable for the git hooks when working through the SSH-protocol

When cleaning this environment variable can be problems with the processing of non-ASCII data

CHANGELOG

+v2.6.5 (unreleased)
+  - Do not clean LANG environment variable for the git hooks when working through the SSH-protocol
+
 v2.6.4
   - Remove keys from authorized_keys in-place
   - Increase batch_add_keys lock timeout to 300 seconds

lib/gitlab_shell.rb

@@ -122,6 +122,7 @@ class GitlabShell
     env = {
       'PATH' => ENV['PATH'],
       'LD_LIBRARY_PATH' => ENV['LD_LIBRARY_PATH'],
+      'LANG' => ENV['LANG'],
       'GL_ID' => @key_id
     }