Changed i18n example into PageHeader component

src/components/PageHeader/PageHeader.jsx

+import React from 'react';
+import { useTranslation } from 'react-i18next';
+
+export const PageHeader = () => {
+    const { t, i18n } = useTranslation();
+    return(
+        <header>
+            <div>
+                <button onClick={() => changeLanguage('de')}>Deutsch</button>
+                <button onClick={() => changeLanguage('en')}>English</button>
+                <button onClick={() => changeLanguage('fr')}>Français</button>
+                <button onClick={() => changeLanguage('ar')}>لعربية</button>
+            </div>
+            <h1>{t('EntangledAfrica1')}</h1>
+            <h2>{t('EntangledAfrica2')}</h2>
+        </header>
+    )
+};
\ No newline at end of file