Update index properties keys
Update index.html properties keys
Add common keyx to about.html
Add about.html specific keys
Add about.html fr basic translation
Fix typo on 2 keys
Add stats page keys
Fix active class in About menu
Update 2 keys moved to common, as they are used by several pages
Add stats page fr basic translation
Add visitors key on php counter
Add downloads key on php counter
Add webL10n library to stats page
Update typos on download strings