Add a preferred language dropdown

src/shared/ExtensionMessage.ts

@@ -55,6 +55,7 @@ export interface ExtensionState {
 	diffEnabled?: boolean
 	browserLargeViewport?: boolean
 	fuzzyMatchThreshold?: number
+	preferredLanguage: string
 }
 
 export interface ClineMessage {

src/shared/WebviewMessage.ts

@@ -40,6 +40,7 @@ export interface WebviewMessage {
 		| "toggleToolAlwaysAllow"
 		| "toggleMcpServer"
 		| "fuzzyMatchThreshold"
+		| "preferredLanguage"
 	text?: string
 	disabled?: boolean
 	askResponse?: ClineAskResponse