Addressee, Email and Postal Greetings import - improve the error messages and make sure all import error messages are localized

Exported a contact with default Addressee, Email Greeting and Postal Greeting - and then tried to re-import.

Invalid value for field(s) : Addressee; Email Greeting; Postal Greeting
value for Addressee = Mrs Monica T Grant Sr
value for both Greetings = Dear Monica

We require that these three fields use the option labels configured for the site - so you can't actually import the evaluated, exported values. You need to use values like this:
'Dear

{contact.individual_prefix}

{contact.last_name}

'

I've updated the error messages to make this clear:
'Email Greeting must be one of the configured format options. Check Administer >> Option Lists >> Email Greetings for valid values'

Also, none of the error messages for various Parser errors were localized. Added ts('') around them.