Comment 13 for bug 406662

Workaround for osx issue as discussed in comments #3-12 committed to trunk in r11765 and backported to 0.48.x (r9917):
- add console messages to help debug incorrect LANG settings
- use 'en_US.UTF-8' fallback setting for LANG if currect detection fails
  addresses issues with failing python extensions which use setlocale()

Note: OS X package of Inkscape still needs more robust language detection (e.g. bug #617079, bug #476678).