Enable language specific text in Gutterball

Updated key files for gutterball and common
Added .po files for gutterball and common
Updated buildfile to complete gutterball war file
Updated I18nProvider declaration
Buildr config to consolidate all translations under common.

The XNap I18n library we are using makes it impossible to chain
ResourceBundles in a parent-child relationship.  Each I18n object can
only point to one ResourceBundle.  Rather than attempt to reimplement
the I18n functionality, we will conform to XNap's expectation of a
single ResourceBundle by putting all the strings into a keys file under
common.
Move all current translations to common.
Merge all PO and POT files and place under common.
Package the PO files in common.
Make runtime classes for translations come from new common implementation