Allow to move widget grid position using keyboards shortcuts.
Added version number to pygubu module and About dialog.
Fix properties validators to work on python 2.7
Fixed typo on function name get_layout_property.
Add utility scripts
Builder class can now translate marked properties using a translator function.
Fix UTF-8 encoding.
Make code strings traslatable.
Make GUI files translatable.
Don't use version.txt anymore.
Added spanish translation.
Update version number to 0.8