Set the current language once and only once, here. The language name is stored in a static buffer inside the Stream Manager. In order to resolve localized (language-specific) file location, AK::StreamMgr::IAkFileLocationResolver implementations query this string. They may use it to construct a file path (for e.g. SDK/samples/SoundEngine/Common/AkFileLocationBase.cpp), or to find a language-specific file within a look-up table (for e.g. SDK/samples/SoundEngine/Common/AkFilePackageLUT.cpp). Pass a valid null-terminated string, without a trailing slash or backslash. Empty strings are accepted. You may register for language changes (see RegisterToLanguageChangeNotification()). After changing the current language, all observers are notified.