This adds some factory/builder methods to the LocaleDatabase so that clients who are loading a LocaleDatabase do not need to know or care about its location, they just need to know what iso language code to use or load the one for the default locale. This basically codifies and encapsulates the logic used to load lang packs so that clients have a more standardized way of loading them. This will remove some duplicate code when LocaleDatabase classes are updated to use the new methods.