Merge pull request #11048 from comoyo/vcf-encoding

Bug 883278 - [contacts] importing from .vcf file (sd card) puts providedfirstname and lastname in firstname field if both contain only ascii characters, causes sort by lastname to fail [r=arcturus]
(cherry picked from commit bbad03e30527e1df8261a462e5cefbdc562f0819)

Conflicts:
	apps/communications/contacts/js/utilities/vcard_parser.js