Improvement of spanish translation

The actual spanish translation does not fit Spanish from Spain. It might be alright for other Spanish speaking countries though, so a few questions: who did this translation? Is it used a lot right now? Are users happy with it?

As language forms are sometimes different amongst Spanish speaking countries, I suggest splitting the Spanish translation to allow each country have his own. We would get:
ApplicationResources_es_es.properties for Spain
ApplicationResources_es_ar.properties for Argentina
ApplicationResources_es_co.properties for Colombia
...

A proposition for es_es translation is attached to this issue.