Localized strings extracted to a separate, dedicated 'iRate' table.

Using a separate table avoids problems with corrupted Localized.strings files every other build (http://stackoverflow.com/questions/11481348/localizable-strings-failing-to-load-every-other-build). Problem occurs at least on Xcode 5.1.1, seems to be fixed in Xcode 6.

Creating a dedicated 'iRate' table, distinct from project-specific localization seems to be a good practice anyway, see: https://github.com/mattt/FormatterKit