Update es_419.json

[sirklosterIII]

Adding better latin spanish translations

Problem

In Latin America the following terms are usually used:

• Documento, instead of ID card, leads to confusion with credit cards
• Frente instead of anverso
• Dorso instead of reverso

Solution

Changed translations in the es_419.json file from Latin American Spanish

Checklist

put n/a if item is not relevant to PR changes

• Has the CHANGELOG been updated?
• Has the README been updated?
• Has the CONTRIBUTING doc been updated?
• Has the RELEASE_GUIDELINES been updated?
• Has the TESTING_GUIDELINES been updated?
• Has the MIGRATION doc been updated for any MAJOR breaking changes?
• Has the MIGRATION doc been updated for any MINOR breaking changes, including any translation strings or keys changes?
• Have any new automated tests been implemented or the existing ones changed?
• Have any new manual tests been written down or the existing ones changed?
• Have any new strings been translated or the existing ones changed?