Added lib/gui_lite.py to be able to translate text

Added lib/gui_lite.py to be able to translate text strings from the Lite mode.

I don't know if the lib/gui_text.py need to be added too.

Now text strings from the Lite mode can be translated.
Merge pull request #117 from rdymac/patch-16

Added lib/gui_lite.py to be able to translate text