Complete missing Spanish (es-419) translations

[dedosmedia]

Description

This PR improves the Spanish translations by completing missing keys and ensuring consistency across the es-419 locale.

Reason for the change:

• Some translation keys were missing or only available in English.

Improvement/Solution:

• Completed missing translations in app/_locales/es_419/messages.json.

Changelog

CHANGELOG entry: Completed missing Spanish (es-419) translations for Latin American locale.

Related issues

Fixes: N/A

Manual testing steps

1. Build the extension locally after pulling this branch.
2. Ensure app/_locales/es_419/messages.json contains all keys present in en/messages.json.
3. Load the extension in Chrome/Brave with es-419 locale active.
4. Confirm that all UI strings are translated and no keys fall back to English.
5. Validate that no JSON formatting errors exist and descriptions remain unchanged.

Screenshots/Recordings

Before

(Some messages were missing or shown in English.)

After

(All messages are now available in Latin American Spanish.)

Pre-merge author checklist

• I've followed MetaMask Contributor Docs.
• I've completed the PR template to the best of my ability.
• I’ve included tests if applicable.
• I’ve documented my code using JSDoc format if applicable.
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR.
• I confirm that this PR addresses the acceptance criteria and includes necessary testing evidence.

---

Note

Adds extensive missing Latin American Spanish translations and standardizes terminology in app/_locales/es_419/messages.json.

• i18n (es-419) in app/_locales/es_419/messages.json:
  • Add comprehensive translations for new and existing UI areas: Bridge, Swaps, Smart Accounts, Snaps, Notifications, Security Alerts, Networks, Gas/Fees, NFTs, DeFi, Errors, Settings, and more.
  • Standardize terminology and tone (e.g., prefer billetera over cartera, shift to informal “tú”), and fix grammar/consistency.
  • Update numerous existing strings/tooltips and add descriptions where applicable.
  • No functional/code changes; localization content only.

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[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[dedosmedia]

I have read the CLA Document and I hereby sign the CLA

[dfdiaza]

I have read the CLA Document and I hereby sign the CLA