French Translations Updates

Updates client and server
Fix wrong "active" in privacy.html
Use same same terms between faq/tos/privacy page.
Fix post highlighting.
FIX: reply by email can handle emails with attachments. Attachments are still ignored, but a post or topic can be created from the email now.
update zh_cn translation
Merge pull request #2195 from fantasticfears/locale

update zh_CN locale
Merge pull request #2184 from Onaldanm/translate-fr-updates

French Translations Updates
Merge pull request #2201 from vikhyat/fix-post-highlight

Fix post highlighting