diff --git a/demo-app/LOCALISATION.md b/demo-app/LOCALISATION.md
new file mode 100644
index 0000000..9836451
--- /dev/null
+++ b/demo-app/LOCALISATION.md
@@ -0,0 +1,117 @@
+# Guide de Localisation / Localization Guide
+
+## Français
+
+### Fonctionnalité ajoutée
+
+L'application Android Remote Notify Demo App supporte maintenant le français ! L'application détecte automatiquement la langue du système et affiche l'interface dans la langue appropriée.
+
+### Langues supportées
+
+- **Anglais** (par défaut) - `values/strings.xml`
+- **Français** - `values-fr/strings.xml`
+
+### Comment tester
+
+1. **Pour tester en français :**
+   - Allez dans les Paramètres de votre appareil Android
+   - Sélectionnez "Langues et entrée" ou "Language & input"
+   - Changez la langue principale vers "Français"
+   - Redémarrez l'application
+
+2. **Pour tester en anglais :**
+   - Remettez la langue de l'appareil en "English"
+   - Redémarrez l'application
+
+### Éléments traduits
+
+- Titre de l'application
+- Interface principale (enregistrement du token)
+- Écran des paramètres
+- Messages d'état et d'erreur
+- Messages toast (notifications temporaires)
+- Menu et navigation
+
+### Ajouter d'autres langues
+
+Pour ajouter une nouvelle langue (ex: espagnol) :
+
+1. Créez un nouveau dossier : `app/src/main/res/values-es/`
+2. Copiez le fichier `strings.xml` depuis `values/`
+3. Traduisez toutes les chaînes de caractères
+4. Testez avec un appareil configuré en espagnol
+
+---
+
+## English
+
+### Added Feature
+
+The Remote Notify Demo App Android application now supports French! The app automatically detects the system language and displays the interface in the appropriate language.
+
+### Supported Languages
+
+- **English** (default) - `values/strings.xml`
+- **French** - `values-fr/strings.xml`
+
+### How to Test
+
+1. **To test in French:**
+   - Go to your Android device Settings
+   - Select "Languages and input"
+   - Change the primary language to "Français" (French)
+   - Restart the application
+
+2. **To test in English:**
+   - Change device language back to "English"
+   - Restart the application
+
+### Translated Elements
+
+- Application title
+- Main interface (token registration)
+- Settings screen
+- Status and error messages
+- Toast messages (temporary notifications)
+- Menu and navigation
+
+### Adding Other Languages
+
+To add a new language (e.g., Spanish):
+
+1. Create a new folder: `app/src/main/res/values-es/`
+2. Copy the `strings.xml` file from `values/`
+3. Translate all string values
+4. Test with a device configured in Spanish
+
+---
+
+## Technical Implementation
+
+### Structure
+
+```
+app/src/main/res/
+├── values/
+│   └── strings.xml          # English (default)
+├── values-fr/
+│   └── strings.xml          # French
+└── layout/
+    ├── activity_main.xml    # Uses @string/ references
+    └── activity_settings.xml # Uses @string/ references
+```
+
+### Code Changes
+
+- All hardcoded strings moved to resource files
+- Kotlin code updated to use `getString(R.string.resource_name)`
+- Layout files updated to use `@string/resource_name`
+- Proper parameter formatting with `%1$s`, `%1$d` for dynamic content
+
+### Best Practices
+
+- Always use string resources instead of hardcoded text
+- Use proper parameter formatting for dynamic strings
+- Test all languages on actual devices
+- Keep string keys consistent and descriptive
+- Add comments to organize string resources
diff --git a/demo-app/app/src/main/java/org/nella/rn/demo/MainActivity.kt b/demo-app/app/src/main/java/org/nella/rn/demo/MainActivity.kt
index 3978a57..8a24127 100644
--- a/demo-app/app/src/main/java/org/nella/rn/demo/MainActivity.kt
+++ b/demo-app/app/src/main/java/org/nella/rn/demo/MainActivity.kt
@@ -76,17 +76,17 @@ class MainActivity : AppCompatActivity() {
     
     private fun updateStatusWithBackendUrl() {
         val backendUrl = SettingsActivity.getBackendUrl(this)
-        updateStatus("Ready to register with backend: $backendUrl")
+        updateStatus(getString(R.string.status_ready_to_register, backendUrl))
     }
     
     private fun registerDeviceToken() {
-        updateStatus("Getting notification token...")
+        updateStatus(getString(R.string.status_getting_token))
         registerButton.isEnabled = false
         
         FirebaseMessaging.getInstance().token.addOnCompleteListener { task ->
             if (!task.isSuccessful) {
                 Log.w(TAG, "Fetching Firebase registration token failed", task.exception)
-                updateStatus("Failed to get notification token: ${task.exception?.message}")
+                updateStatus(getString(R.string.status_failed_get_token, task.exception?.message ?: ""))
                 registerButton.isEnabled = true
                 return@addOnCompleteListener
             }
@@ -101,14 +101,14 @@ class MainActivity : AppCompatActivity() {
     }
     
     private fun sendTokenToServer(token: String) {
-        updateStatus("Encrypting and sending token to server...")
+        updateStatus(getString(R.string.status_encrypting_token))
         
         // Encrypt the token before sending
         val encryptedToken = try {
             encryptToken(token)
         } catch (e: Exception) {
             Log.e(TAG, "Failed to encrypt token", e)
-            updateStatus("Failed to encrypt token: ${e.message}")
+            updateStatus(getString(R.string.status_failed_encrypt, e.message ?: ""))
             registerButton.isEnabled = true
             return
         }
@@ -131,7 +131,7 @@ class MainActivity : AppCompatActivity() {
             override fun onFailure(call: Call, e: IOException) {
                 Log.e(TAG, "Failed to send token to server", e)
                 runOnUiThread {
-                    updateStatus("Failed to register token: ${e.message}")
+                    updateStatus(getString(R.string.status_failed_register, e.message ?: ""))
                     registerButton.isEnabled = true
                 }
             }
@@ -142,9 +142,9 @@ class MainActivity : AppCompatActivity() {
                 
                 runOnUiThread {
                     if (response.isSuccessful) {
-                        updateStatus("Encrypted token registered successfully!")
+                        updateStatus(getString(R.string.status_success))
                     } else {
-                        updateStatus("Server error: ${response.code}\n$responseBody")
+                        updateStatus(getString(R.string.status_server_error, response.code, responseBody))
                     }
                     registerButton.isEnabled = true
                 }
diff --git a/demo-app/app/src/main/java/org/nella/rn/demo/SettingsActivity.kt b/demo-app/app/src/main/java/org/nella/rn/demo/SettingsActivity.kt
index 63f8244..84a56e4 100644
--- a/demo-app/app/src/main/java/org/nella/rn/demo/SettingsActivity.kt
+++ b/demo-app/app/src/main/java/org/nella/rn/demo/SettingsActivity.kt
@@ -58,19 +58,19 @@ class SettingsActivity : AppCompatActivity() {
         
         // Enable back button
         supportActionBar?.setDisplayHomeAsUpEnabled(true)
-        supportActionBar?.title = "Settings"
+        supportActionBar?.title = getString(R.string.settings_title)
     }
     
     private fun saveUrl() {
         val url = urlEditText.text.toString().trim()
         
         if (url.isEmpty()) {
-            Toast.makeText(this, "URL cannot be empty", Toast.LENGTH_SHORT).show()
+            Toast.makeText(this, getString(R.string.toast_url_empty), Toast.LENGTH_SHORT).show()
             return
         }
         
         if (!isValidUrl(url)) {
-            Toast.makeText(this, "Please enter a valid URL (e.g., https://example.com)", Toast.LENGTH_LONG).show()
+            Toast.makeText(this, getString(R.string.toast_url_invalid), Toast.LENGTH_LONG).show()
             return
         }
         
@@ -78,7 +78,7 @@ class SettingsActivity : AppCompatActivity() {
         val cleanUrl = url.trimEnd('/')
         
         setBackendUrl(this, cleanUrl)
-        Toast.makeText(this, "Backend URL saved successfully", Toast.LENGTH_SHORT).show()
+        Toast.makeText(this, getString(R.string.toast_url_saved), Toast.LENGTH_SHORT).show()
         
         // Return to main activity
         finish()
@@ -86,7 +86,7 @@ class SettingsActivity : AppCompatActivity() {
     
     private fun resetToDefault() {
         urlEditText.setText(DEFAULT_BACKEND_URL)
-        Toast.makeText(this, "Reset to default URL", Toast.LENGTH_SHORT).show()
+        Toast.makeText(this, getString(R.string.toast_reset_default), Toast.LENGTH_SHORT).show()
     }
     
     private fun isValidUrl(url: String): Boolean {
diff --git a/demo-app/app/src/main/res/layout/activity_main.xml b/demo-app/app/src/main/res/layout/activity_main.xml
index 64bde54..cf310d1 100644
--- a/demo-app/app/src/main/res/layout/activity_main.xml
+++ b/demo-app/app/src/main/res/layout/activity_main.xml
@@ -10,7 +10,7 @@
         android:id="@+id/titleText"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Token Registration"
+        android:text="@string/title_token_registration"
         android:textSize="24sp"
         android:textStyle="bold"
         app:layout_constraintBottom_toTopOf="@+id/registerButton"
@@ -24,7 +24,7 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_marginTop="32dp"
-        android:text="Register Device Token"
+        android:text="@string/button_register_device_token"
         android:textSize="16sp"
         app:layout_constraintBottom_toTopOf="@+id/statusText"
         app:layout_constraintEnd_toEndOf="parent"
@@ -38,7 +38,7 @@
         android:layout_marginTop="24dp"
         android:layout_marginStart="16dp"
         android:layout_marginEnd="16dp"
-        android:text="Press the button to register your device token"
+        android:text="@string/status_press_button"
         android:textAlignment="center"
         android:textSize="14sp"
         app:layout_constraintBottom_toBottomOf="parent"
diff --git a/demo-app/app/src/main/res/layout/activity_settings.xml b/demo-app/app/src/main/res/layout/activity_settings.xml
index f1578d8..a379dfd 100644
--- a/demo-app/app/src/main/res/layout/activity_settings.xml
+++ b/demo-app/app/src/main/res/layout/activity_settings.xml
@@ -8,7 +8,7 @@
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Backend Server Configuration"
+        android:text="@string/settings_backend_config"
         android:textSize="20sp"
         android:textStyle="bold"
         android:layout_marginBottom="16dp" />
@@ -16,7 +16,7 @@
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Enter the URL of your app backend server:"
+        android:text="@string/settings_enter_url"
         android:textSize="16sp"
         android:layout_marginBottom="8dp" />
 
@@ -24,7 +24,7 @@
         android:id="@+id/urlEditText"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:hint="https://demo.rn.nella.org"
+        android:hint="@string/settings_url_hint"
         android:inputType="textUri"
         android:layout_marginBottom="16dp"
         android:padding="12dp"
@@ -33,7 +33,7 @@
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="Examples:\n• https://demo.rn.nella.org\n• https://your-domain.com\n• https://10.0.2.2:8443 (Android emulator)"
+        android:text="@string/settings_examples"
         android:textSize="14sp"
         android:textColor="@android:color/darker_gray"
         android:layout_marginBottom="24dp" />
@@ -49,7 +49,7 @@
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text="Reset to Default"
+            android:text="@string/button_reset_default"
             android:layout_marginEnd="8dp"
             style="?android:attr/borderlessButtonStyle" />
 
@@ -58,7 +58,7 @@
             android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:text="Save"
+            android:text="@string/button_save"
             android:layout_marginStart="8dp" />
 
     </LinearLayout>
@@ -66,7 +66,7 @@
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:text="\n🔒 Security Note:\nAll communication uses encrypted notification tokens. The backend URL should use HTTPS for security."
+        android:text="@string/settings_security_note"
         android:textSize="12sp"
         android:textColor="@android:color/darker_gray"
         android:layout_marginTop="24dp"
diff --git a/demo-app/app/src/main/res/menu/main_menu.xml b/demo-app/app/src/main/res/menu/main_menu.xml
index 88f69d1..3b4f83c 100644
--- a/demo-app/app/src/main/res/menu/main_menu.xml
+++ b/demo-app/app/src/main/res/menu/main_menu.xml
@@ -4,7 +4,7 @@
     
     <item
         android:id="@+id/action_settings"
-        android:title="Settings"
+        android:title="@string/menu_settings"
         android:icon="@android:drawable/ic_menu_preferences"
         app:showAsAction="ifRoom" />
         
diff --git a/demo-app/app/src/main/res/values-fr/strings.xml b/demo-app/app/src/main/res/values-fr/strings.xml
new file mode 100644
index 0000000..36761ae
--- /dev/null
+++ b/demo-app/app/src/main/res/values-fr/strings.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Nom de l'application -->
+    <string name="app_name">App de Démo Remote Notify</string>
+    
+    <!-- Activité principale -->
+    <string name="title_token_registration">Enregistrement du Token</string>
+    <string name="button_register_device_token">Enregistrer le Token d’Appareil</string>
+    <string name="status_ready_to_register">Prêt à s’enregistrer avec le backend : %1$s</string>
+    <string name="status_press_button">Appuyez sur le bouton pour enregistrer votre token d’appareil</string>
+    <string name="status_getting_token">Récupération du token de notification...</string>
+    <string name="status_failed_get_token">Échec de la récupération du token de notification : %1$s</string>
+    <string name="status_encrypting_token">Chiffrement et envoi du token au serveur...</string>
+    <string name="status_failed_encrypt">Échec du chiffrement du token : %1$s</string>
+    <string name="status_failed_register">Échec de l’enregistrement du token : %1$s</string>
+    <string name="status_success">Token chiffré enregistré avec succès !</string>
+    <string name="status_server_error">Erreur serveur : %1$d\n%2$s</string>
+    
+    <!-- Activité de paramètres -->
+    <string name="settings_title">Paramètres</string>
+    <string name="settings_backend_config">Configuration du Serveur Backend</string>
+    <string name="settings_enter_url">Entrez l’URL de votre serveur backend d’application :</string>
+    <string name="settings_url_hint">https://demo.rn.nella.org</string>
+    <string name="settings_examples">Exemples :\n• https://demo.rn.nella.org\n• https://votre-domaine.com\n• https://10.0.2.2:8443 (émulateur Android)</string>
+    <string name="button_reset_default">Réinitialiser par Défaut</string>
+    <string name="button_save">Enregistrer</string>
+    <string name="settings_security_note">\n🔒 Note de Sécurité :\nToute communication utilise des tokens de notification chiffrés. L’URL du backend devrait utiliser HTTPS pour la sécurité.</string>
+    
+    <!-- Messages toast -->
+    <string name="toast_url_empty">L’URL ne peut pas être vide</string>
+    <string name="toast_url_invalid">Veuillez entrer une URL valide (ex: https://example.com)</string>
+    <string name="toast_url_saved">URL du backend enregistrée avec succès</string>
+    <string name="toast_reset_default">Réinitialisation à l’URL par défaut</string>
+    
+    <!-- Menu -->
+    <string name="menu_settings">Paramètres</string>
+</resources>
\ No newline at end of file
diff --git a/demo-app/app/src/main/res/values/strings.xml b/demo-app/app/src/main/res/values/strings.xml
index a72acaa..9425e84 100644
--- a/demo-app/app/src/main/res/values/strings.xml
+++ b/demo-app/app/src/main/res/values/strings.xml
@@ -1,3 +1,36 @@
 <resources>
+    <!-- App name -->
     <string name="app_name">Remote Notify Demo App</string>
+    
+    <!-- Main Activity -->
+    <string name="title_token_registration">Token Registration</string>
+    <string name="button_register_device_token">Register Device Token</string>
+    <string name="status_ready_to_register">Ready to register with backend: %1$s</string>
+    <string name="status_press_button">Press the button to register your device token</string>
+    <string name="status_getting_token">Getting notification token...</string>
+    <string name="status_failed_get_token">Failed to get notification token: %1$s</string>
+    <string name="status_encrypting_token">Encrypting and sending token to server...</string>
+    <string name="status_failed_encrypt">Failed to encrypt token: %1$s</string>
+    <string name="status_failed_register">Failed to register token: %1$s</string>
+    <string name="status_success">Encrypted token registered successfully!</string>
+    <string name="status_server_error">Server error: %1$d\n%2$s</string>
+    
+    <!-- Settings Activity -->
+    <string name="settings_title">Settings</string>
+    <string name="settings_backend_config">Backend Server Configuration</string>
+    <string name="settings_enter_url">Enter the URL of your app backend server:</string>
+    <string name="settings_url_hint">https://demo.rn.nella.org</string>
+    <string name="settings_examples">Examples:\n• https://demo.rn.nella.org\n• https://your-domain.com\n• https://10.0.2.2:8443 (Android emulator)</string>
+    <string name="button_reset_default">Reset to Default</string>
+    <string name="button_save">Save</string>
+    <string name="settings_security_note">\n🔒 Security Note:\nAll communication uses encrypted notification tokens. The backend URL should use HTTPS for security.</string>
+    
+    <!-- Toast messages -->
+    <string name="toast_url_empty">URL cannot be empty</string>
+    <string name="toast_url_invalid">Please enter a valid URL (e.g., https://example.com)</string>
+    <string name="toast_url_saved">Backend URL saved successfully</string>
+    <string name="toast_reset_default">Reset to default URL</string>
+    
+    <!-- Menu -->
+    <string name="menu_settings">Settings</string>
 </resources>