Bootstrap of an fr-FR edition from @evolena and @xcazin

Starting from the tw5.com edition using the includeWikis config of tiddlywiki.info, we override tiddlers with their French counterpart, little by little. 

In order to keep cross-references (ToC, links, etc), we don't change the English `title` field, but we set the `caption` field to its french translation. 

In order to see the French `caption` when it exists, we've overriden a few system tiddlers, including `$:/core/ui/DefaultSearchResultList` or `$:/core/ui/ViewTemplate/title`.

Anyone interested in improving the documentation in French welcome!