Add translations for multiple Spanish dialects

[elhertz]

Add translation files for all the following spanish-speaking countries:

• es_ar.json - Argentina
• es_cl.json - Chile
• es_ec.json - Ecuador
• es_es.json - Spain
• es_mx.json - Mexico
• es_uy.json - Uruguay
• es_ve.json - Venezuela

Note: translations match with their respective official translation.