drupalExtension is fully translated to Spanish

[jose-carmona]

Steps translated:

• the/these (following )languages are available:
• users:
• I should see (the text ):text in the :rowText row
• I should not see (the text ):text in the :rowText row
• I am logged in as a/an :role
• I (should ) see the button :button
• I (should ) see the :button button
• I should not see the button :button
• I should not see the :button button
• I should see the button :button in the :region( region)
• I should see the :button button in the :region( region)
• I( should) see the :tag element in the :region( region)
• I( should) not see the :tag element in the :region( region)
• I( should) not see :text in the :tag element in the :region( region)
• I( should) see the :tag element with the :attribute attribute set to :value in the :region( region)
• I( should) see :text in the :tag element with the :attribute attribute set to :value in the :region( region)
• I( should) see :text in the :tag element with the :property CSS property set to :value in the :region( region)

I think with this PR drupalExtension is fully translated to Spanish.

This PR creates an environment for testing translations placing a 'i18n' directory in which to place the translations of the features.

[jhedstrom]

This is fantastic! Thanks for the tests too!