Crash bug fix, localization and Japanese resources

This pull request contains following fix and changes:
Fixes:
- Crash (BAD_ACCESS) on application quit (confirmed on OSX 10.9.3)
- Fixed all necessary code changes to support full localization. (NSLocalizadString, Changing charset form Ascii to UTF-8 on WebView contents handling)

Changes:
- PixenIntro moved into English.lproj for localization

Added:
- Added Full Japanese localization resources to support Japanese locale.