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>

mcp-server/src/core/direct-functions/response-language.js

@@ -0,0 +1,40 @@
+/**
+ * response-language.js
+ * Direct function for managing response language via MCP
+ */
+
+import { setResponseLanguage } from '../../../../scripts/modules/task-manager.js';
+import {
+	enableSilentMode,
+	disableSilentMode
+} from '../../../../scripts/modules/utils.js';
+import { createLogWrapper } from '../../tools/utils.js';
+
+export async function responseLanguageDirect(args, log, context = {}) {
+	const { projectRoot, language } = args;
+	const mcpLog = createLogWrapper(log);
+
+	log.info(
+		`Executing response-language_direct with args: ${JSON.stringify(args)}`
+	);
+	log.info(`Using project root: ${projectRoot}`);
+
+	try {
+		enableSilentMode();
+		return setResponseLanguage(language, {
+			mcpLog,
+			projectRoot
+		});
+	} catch (error) {
+		return {
+			success: false,
+			error: {
+				code: 'DIRECT_FUNCTION_ERROR',
+				message: error.message,
+				details: error.stack
+			}
+		};
+	} finally {
+		disableSilentMode();
+	}
+}