chore(language-detector): add export to jsr

jsr.json

@@ -53,6 +53,7 @@
     "./powered-by": "./src/middleware/powered-by/index.ts",
     "./pretty-json": "./src/middleware/pretty-json/index.ts",
     "./request-id": "./src/middleware/request-id/request-id.ts",
+    "./language": "./src/middleware/language/language.ts",
     "./secure-headers": "./src/middleware/secure-headers/secure-headers.ts",
     "./combine": "./src/middleware/combine/index.ts",
     "./ssg": "./src/helper/ssg/index.ts",