PropertyDictionarySingle Mass import and Localization

Hi,

How can you mass import availaible values for a commerce field backed by  [BackingType(typeof(PropertyDictionarySingle))] ?

How should localization be handled ?
    Right now I think the only approach I see is to have the values piped:  IdForSynchro||Value Language 1||Value Language 2
    However this will affect search and I am unsure what will happen to all products that currently have a value set when the source dictionary values changes

Thanks