Added french lang files
Email library: htmlspecialchars for _header_str
Merge pull request #2337 from moi90/2.1-stable

Email library: htmlspecialchars for _header_str
Merge remote-tracking branch 'upstream_zoubi/2.1-stable' into upstream_zoubi_2.1-stable
Merge branch 'upstream_CI_2.1-stable' into upstream_zoubi_2.1-stable