sync french translation with recent changes
fix a few typos
adapt some sentences to be more accurate
vocabulary : try not to be too dissuasive about mining while staying accurate
community : add the Foundation forum in the community page
about : make clear that "only one incident" refers to the protocol only
implement multilanguage
new improved clients list page
update history and statistics in the "about" page
add "Some things you need to know" page
add "Support Bitcoin" page
add a contextual presentation for each category of users (individuals, organizations, developers and enthusiasts)
add a short and concise "how it works" page
add a "vocabulary" page for Bitcoin technical words definitions
give more visibility for the foundation
new website design and layout