Added two BS-RoFormer models with complete frontend support

• 🎤 New vocal model: Added BS Roformer Mag Anvuew to Extract Vocals for better magnitude-spectrum accuracy and vocal clarity.
• 🧼 New dereverb model: Added BS Roformer Dereverb Anvuew to Dereverb for cleaner noreverb output.
• 🌐 i18n update: Added localized model names and descriptions for consistent multilingual display.
• 🧩 Frontend sync: Updated model config and output stem typing so both models can be selected and submitted normally.