[WIP] Check system date when starting packaged Marketplace (bug 1019122)

If the device clock is too far behind the user will get a certificate error, so let's display our own error message instead.

WIP, need translations first, the translations for the error messages generated by yulelog package are directly hardcoded into the package main.js file :(
yeah, once we become a real package app this code should be moved to the main js files and it will have access to l10n.js etc