Skeleton for language picker.

src/components/Header.tsx

@@ -1,10 +1,15 @@
+import { FormattedMessage } from 'react-intl';
+import { LanguagePicker } from './LanguagePicker';
 import "./styles/header.scss"
 
 export const Header = () => {
     return (
         <header className="App-header">
-            <h1>Lintu ja Maslo</h1>
-            <p><i>Elokuussa 2022</i></p>
+            <h1><FormattedMessage id="common.title" /></h1>
+            <p><i><FormattedMessage id="common.subtitle" /></i></p>
+            <div className="LanguagePicker-container">
+                <LanguagePicker />
+            </div>
         </header>
     )
 }