Use preferred language for Display Name, Email/Postal greeting and Addressee

Some contact fields are computed when submitting and are using token that can be translated (like the contact prefix). I can identify 4 of them :

• Display name
• Email Greeting
• Postal Greeting
• Addressee

The problem is that, in a multilingual site, the language used for the computation is the current navigation language. It makes more sense to use the preferred language of the contact updated.