One Quickie

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Determining current localization you're running in. (Random->General)

You can use this to find which of the user's preferred localizations/locales that is also supported by your app. (translation, what localization you're currently running in)

NSString *languageused = [[[NSBundle mainBundle] preferredLocalizations] objectAtIndex: 0];

(thanks to Glenn Fawcett for this one!)