Localization update to allow *all* base data to be localized.

Instead of putting all this base data inside of a header file in the form of an array, they are loaded from a data file at runtime based on locale. There are four files to translate: property-data-LANG.txt, ingredient-data-LANG.txt, unit-data-LANG.txt, and prep-data-LANG.txt.

Also, the user gets a message if they ask to import nutrient data and there is no localized data for their language. They can continue, using English data, or decide not to do the import.