feat: split Spanish locale into es-ES and es-LA

[aspectedu]

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Description

The previous Spanish translation was heavily influenced by a specific regional dialect (Argentine Spanish), including local slang like "piola" and "voseo" (verbs like empezá, añadí). This felt unprofessional for users from Spain and other Spanish-speaking regions.

Changes

1. Separation of locales: Moved the original regional strings to src/locales/es-LA.
2. New Standard/Spain locale: Created src/locales/es-ES using standardized Spanish (Castilian) terminology and formal gaming conventions (inspired by Steam's UI).
3. Structure update: Updated src/locales/index.ts to export both variants, following the project's existing pattern for Portuguese (pt-PT and pt-BR).

This ensures a better user experience for all Spanish speakers by allowing them to choose their preferred dialect in the settings menu.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud