Add to_sym to Tolk::Locale
Move Locale language_name attribute to database
Revert "Move Locale language_name attribute to database"

Intended use case was using tolk together with globalize3.
But both define an association named :translations.

This reverts commit bf9888282eab32f11178ee555eaa0f919dad7083.
Merge branch 'master' into 1-2-stable