Skeleton for language picker.

package.json

@@ -12,8 +12,10 @@
     "firebase": "^9.1.3",
     "react": "^17.0.2",
     "react-dom": "^17.0.2",
+    "react-intl": "^5.21.1",
     "react-router-dom": "^5.3.0",
     "react-scripts": "4.0.3",
+    "recoil": "^0.5.2",
     "sass": "^1.43.4",
     "typescript": "^4.1.2"
   },
@@ -21,7 +23,8 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "extract-intl": "NODE_ENV=development extract-messages -l=en,fi,sk -o src/translations -d en --flat false 'src/**/!(*.test).js'"
   },
   "eslintConfig": {
     "extends": [
@@ -44,6 +47,7 @@
     "fsevents": "^2.3.2"
   },
   "devDependencies": {
-    "@types/react-router-dom": "^5.3.1"
+    "@types/react-router-dom": "^5.3.1",
+    "extract-react-intl-messages": "^4.1.1"
   }
 }