fix in 'select_available_locales_fields' method

Fixes #251
(cherry picked from commit 66c3e3cecbc649fc6f15b8097ef5ddcddd01ff2b)

Signed-off-by: Tobias Bohwalli <hi@futhr.io>
Remove Versionfile

Users should look for a branch matching the current Spree version
they-re running