Hi Francisco,
I'm guessing you need to translate the word "and" to "y" which is the proper connective in Spanish, this is not rails_admin related, just i18n.
If that's the case, then you should change a couple of things:
1) In application.rb you have to set the locale to "es", you also should change your timezone as well:
config.i18n.default_locale = :es
config.time_zone = 'La Paz'
With this command you can see all available timezones
rake time:zones:all
2) Now you have to create a file config/initializers/locales/es.yml with this content:
I think you are looking for this lines, it goes under one level inside "es:" , I'm going to put an extract here:
support:
array:
last_word_connector: " y "
two_words_connector: " y "
words_connector: ", "I hope this helps you, if not let me know.