[Spanish Localization] Inconsistent translation for "Skills" in Agent Customizations view (Habilidades / Capacidades / Aptitudes)

### Summary
In the Spanish localization (`es-ES`) of the **Agent Customizations** view, the single English concept **"Skills" / "Agent Skills"** is inconsistently translated using three different terms (`Habilidades`, `Capacidades`, and `Aptitudes`) within the exact same view, along with an untranslated string in the action button.

### Screenshots

### Detailed Inconsistencies on a Single Screen:
1. **Sidebar Navigation Item**: Translated as **`Habilidades`** (*Skills*).
2. **Main Section Title**: Translated as **`Capacidades`** (*Capabilities*).
3. **Documentation Link**: Translated as *«Más información sobre las **aptitudes** del agente»* (*Aptitudes*).
4. **Primary Action Button**: Label is partially untranslated and uses a third variant: **`+ New Capacidad (Workspace)`** (mixing English "New" with "Capacidad").

### Expected Behavior
The term **"Skills"** should be translated consistently across the entire view and UI.

Since **`Habilidades`** is the standard industry term in Spanish and matches the official documentation, all occurrences in this view should be standardized to:
- **Section Title**: `Habilidades`
- **Documentation Link**: `Más información sobre las habilidades del agente`
- **Action Button**: `+ Nueva habilidad (Espacio de trabajo)` (or `+ Nueva habilidad (Workspace)`)

### Environment:
- **VS Code Version**: Insiders / Latest Stable
- **Language**: Spanish (`es`)