Add translation to Product permalink

Also override the Globalize::ActiveRecord::Migration module in
globalize3 gem because the one in version 0.3.0 doesn't allow us to add
translations to a field in a existing table. No new version of
globalize3 has been released so far.

The module added here includes a `add_translations_fields!` method that
makes it possible to add a new migration file instead of overriding the
other one already checked in the repo.
Add forgotten Property.drop_table on migration file
Add this_file_language back to locale files

The gem depends heavily on these entries because it allow users to pick
which language they'd like to set on the the store

fix the build