Page End + UI adjustments + cleaning

mobile/traque-app/app/(auth)/_layout.jsx

@@ -1,8 +1,42 @@
+// React
+import { View, StyleSheet } from 'react-native';
+import { useTranslation } from 'react-i18next';
 // Expo
 import { Slot } from 'expo-router';
+// Components
+import { IconButton } from '@/components/common/IconButton';
 
 const AuthLayout = () => {
-    return <Slot/>; 
+    const { i18n } = useTranslation();
+
+    const toggleLanguage = () => {
+        i18n.changeLanguage(i18n.language === 'fr' ? 'en' : 'fr');
+    };
+
+    return (
+        <View style={styles.globalContainer}>
+            <Slot/>
+            <IconButton style={styles.languageButton} source={require('@/assets/images/language.png')} onPress={toggleLanguage} />
+        </View>
+    ); 
 };
 
 export default AuthLayout;
+
+const styles = StyleSheet.create({
+    globalContainer: {
+        flex: 1
+    },
+    languageButton: {
+        position: 'absolute',
+        top: 0,
+        right: 0,
+        width: 60,
+        height: 60,
+        backgroundColor: "rgb(126, 182, 199)",
+        borderBottomLeftRadius: 20,
+        padding: 5,
+        justifyContent: 'center',
+        alignItems: 'center',
+    }
+});