Added French i18n support

- Added a 'messages_fr.properties' in "addon-jsf/src/main/resources/org/springframework/roo/addon/jsf/i18n/"

- Added a French flag and a 'messages_fr.properties" in "addon-web-mvc-jsp/src/main/resources/org/springframework/roo/addon/web/mvc/jsp/i18n/languages/"