feat(dashboard): Add i18n support for action buttons
- Create getActionLabelKey() mapper function for action types
- Map action types (approve_po, call_supplier, etc.) to i18n keys
- Extract parameters from metadata (amount, supplier, customer, hours)
- Update button rendering to use translations instead of backend strings
Translation updates:
- Add missing action keys: reject_po, complete_receipt, mark_received
- Spanish translations: "Rechazar pedido", "Completar recepción", etc.
- Basque translations: "Baztertu eskaera", "Osatu stockaren harrera", etc.
Action buttons now respect user's language preference (EN/ES/EU)
instead of showing hardcoded backend strings.
Fixes: Issue #4 - Missing i18n for action buttons
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Co-Authored-By: Claude <noreply@anthropic.com>
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