[Videos] SelectSubtitleLanguage & SelectAudioLanguage: unable to build CultureInfo (1 Viewer)

[Waly]

MediaPortal Version: MediaPortal 1.1.0 BETA 1 SVN-Revision:23978
MediaPortal Skin: Blue3wide
Windows Version: Windows 7 Ultimate 64bit RTM
CPU Type: AMD Athlon 64
Memory: 2GB DDR2
Video Card: ATI HD 3200


Reproduce:
1. In video settings choose default Subtitle Language or Audio Language to Czech
2. During play of movie (or just start some movie) choose context menu and this exception appeares:

SelectAudioLanguage - unable to build CultureInfo, make sure MediaPortal.xml is not corrupted! - System.ArgumentException: Culture name 'czech' is not supported.
Parameter name: name
   in System.Globalization.CultureTableRecord..ctor(String cultureName, Boolean useUserOverride)
   in System.Globalization.CultureTableRecord.GetCultureTableRecord(String name, Boolean useUserOverride)
   in System.Globalization.CultureInfo..ctor(String name, Boolean useUserOverride)
   in MediaPortal.Player.VideoPlayerVMR7.SelectAudioLanguage()

Additional Information:
Constructor CultureInfo does not accept string as "czech" or "english" (stored in Mediaportal.xml by Mediaportal). It accepts strings as "cs", "cs-CZ", "en", ...
When I manually change elements Audiolanguage in Mediaportal.xml to "cs", it starts working and also chooses right audio track. But its not solution... One time it also crashed whole Mediaportal - AccessViolationException. Log attached.