French localisation

thanks to Ronald Leroux
xib tweaks
Photo size slider: Disable instead of hiding when Photo checkbox inactive
Reorganise files and project
add Window → Close menu item with performClose: action

use Window menu as we do not have an Edit menu
de: fix progress bar size
Deal with FAIL-potential of Link to Contacts card checkbox

* turn off by default
* add a tooltip stating that you need a particular setting in Google Earth for the link to work
Update project, Readme, appcast for 3b5