move subscriptions titles and description direclty in json files
 * work on https://github.com/RequestPolicyContinued/subscriptions/issues/1
add a locale file for subscriptions description/titles translation
 * Suggested in https://github.com/RequestPolicyContinued/requestpolicy/issues/550
 * the locale.json file is referenced from official.json
 * the "l10n" serial in official.json should be updated every time the locale.json file is changed
some fixes to readme and fr translations
Merge pull request #16 from nodiscc/master

move subscriptions titles and descriptions to official.json, add localized titles/descriptions in locale.json