feat: Support custom response language (#510)

* feat: Support custom response language

* fix: Add default values for response language in config-manager.js

* chore: Update configuration file and add default response language settings

* feat: Support MCP/CLI custom response language

* chore: Update test comments to English for consistency

* docs: Auto-update and format models.md

* chore: fix format

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>

docs/configuration.md

@@ -44,7 +44,8 @@ Taskmaster uses two primary methods for configuration:
           "ollamaBaseURL": "http://localhost:11434/api",
           "azureBaseURL": "https://your-endpoint.azure.com/openai/deployments",
           "vertexProjectId": "your-gcp-project-id",
-          "vertexLocation": "us-central1"
+          "vertexLocation": "us-central1",
+		      "responseLanguage": "English"
         }
       }
       ```