diff --git a/res/values-cs/google_playstore_strings.xml b/res/values-cs/google_playstore_strings.xml
index 9bc63b2..32d5325 100644
--- a/res/values-cs/google_playstore_strings.xml
+++ b/res/values-cs/google_playstore_strings.xml
@@ -26,6 +26,10 @@
  */
 -->
 <resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
+	<!-- Translations must begin here -->
     <string name="gp_short_description">ownCloud SMS synchronizuje vaše lokální SMS zprávy na váš server ownCloud</string>
     <string name="gp_description">
 Aplikace ownCloud SMS synchronizuje vaše SMS zprávy na vzdálenou instanci ownCloud, kde si poté můžete zprávy přečíst.
diff --git a/res/values-cs/strings.xml b/res/values-cs/strings.xml
index b543a9f..f8631a8 100644
--- a/res/values-cs/strings.xml
+++ b/res/values-cs/strings.xml
@@ -26,7 +26,9 @@
  */
 -->
 <resources>
-    
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">1</string>
+	
     <!-- Translations must begin there -->
     <!-- Preferences -->
     <string name="pref_title_sync_frequency">Frekvence synchronizace</string>
diff --git a/res/values-en/google_playstore_strings.xml b/res/values-en/google_playstore_strings.xml
index 2ce527a..6cb725a 100644
--- a/res/values-en/google_playstore_strings.xml
+++ b/res/values-en/google_playstore_strings.xml
@@ -26,6 +26,10 @@
  */
 -->
 <resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
+	<!-- Translations must begin here -->
     <string name="gp_short_description">ownCloud SMS synchronize your local SMS on your ownCloud instance</string>
     <string name="gp_description">
 ownCloud SMS application synchronize your SMS messages on a remote ownCloud instance and let you read your messages from it.
diff --git a/res/values-en/strings.xml b/res/values-en/strings.xml
index f5877b8..9011565 100644
--- a/res/values-en/strings.xml
+++ b/res/values-en/strings.xml
@@ -26,6 +26,9 @@
  */
 -->
 <resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
     <!-- Translations must begin there -->
     <!-- Preferences -->
     <string name="pref_title_sync">Fast Sync</string>
diff --git a/res/values-es/google_playstore_strings.xml b/res/values-es/google_playstore_strings.xml
new file mode 100644
index 0000000..25d6cff
--- /dev/null
+++ b/res/values-es/google_playstore_strings.xml
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ /*
+ * Copyright (c) 2014, Loic Blot <loic.blot@unix-experience.fr>
+ * All rights reserved.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+-->
+<resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">0</string>
+	
+	<!-- Translations must begin here -->
+    <!-- Missing translations ! -->
+</resources>
\ No newline at end of file
diff --git a/res/values-es/strings.xml b/res/values-es/strings.xml
index 347248f..8135ef5 100644
--- a/res/values-es/strings.xml
+++ b/res/values-es/strings.xml
@@ -28,10 +28,12 @@
 -->
 
 <resources>
-	<string name="pref_title_sync_frequency">Frecuencia de sincronización</string>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">1</string>
 	
-	<!-- Translations must begin there -->
+    <!-- Translations must begin there -->
 	<!-- Preferences -->
+	<string name="pref_title_sync_frequency">Frecuencia de sincronización</string>
 	<string name="action_settings">Configuración</string>
 	<string name="sync_now">Sincronizar ahora</string>
 	<string name="pref_category_sync">Sincronización</string>
diff --git a/res/values-fr/google_playstore_strings.xml b/res/values-fr/google_playstore_strings.xml
index 2b660a7..1bcc01c 100644
--- a/res/values-fr/google_playstore_strings.xml
+++ b/res/values-fr/google_playstore_strings.xml
@@ -26,6 +26,10 @@
  */
 -->
 <resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
+    <!-- Translations must begin there -->
     <string name="gp_short_description">ownCloud SMS permet de synchroniser vos SMS sur votre instance ownCloud</string>
     <string name="gp_description">
 L\'application ownCloud SMS vous permet de synchroniser vos messages SMS sur une instance ownCloud distante et ainsi de pouvoir les lire.
diff --git a/res/values-fr/strings.xml b/res/values-fr/strings.xml
index d0c9535..c8b2a76 100644
--- a/res/values-fr/strings.xml
+++ b/res/values-fr/strings.xml
@@ -26,6 +26,10 @@
  */
 -->
 <resources>
+	<!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
+    <!-- Translations must begin there -->
 
     <string name="app_name">ownCloud-SMS</string>
     <string name="action_settings">Paramètres</string>
@@ -38,11 +42,11 @@
 	<string name="summary_global_pref_to_general_prefs">Options de synchronisation</string>
 	<string name="summary_notif_prefs">Notifications</string>
 	
-    <string name="pref_header_data_sync">Données &amp; synchronisation</string>
-    <string name="pref_title_sync_frequency">Fréquence de synchronisation</string>
-    <string name="pref_title_sync">SMS - Méthode rapide</string>
-    <string name="pref_title_slow_sync">SMS - Méthode lente (sécurisée)</string>
-    <string name="pref_title_slow_sync_frequency">Fréquence de la synchronisation lente</string>
+	<string name="pref_header_data_sync">Données &amp; synchronisation</string>
+	<string name="pref_title_sync_frequency">Fréquence de synchronisation</string>
+	<string name="pref_title_sync">SMS - Méthode rapide</string>
+	<string name="pref_title_slow_sync">SMS - Méthode lente (sécurisée)</string>
+	<string name="pref_title_slow_sync_frequency">Fréquence de la synchronisation lente</string>
 
 	<string name="title_activity_general_settings">Préférences générales</string>
 
diff --git a/res/values/google_playstore_strings.xml b/res/values/google_playstore_strings.xml
index 2ce527a..6cb725a 100644
--- a/res/values/google_playstore_strings.xml
+++ b/res/values/google_playstore_strings.xml
@@ -26,6 +26,10 @@
  */
 -->
 <resources>
+    <!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
+	
+	<!-- Translations must begin here -->
     <string name="gp_short_description">ownCloud SMS synchronize your local SMS on your ownCloud instance</string>
     <string name="gp_description">
 ownCloud SMS application synchronize your SMS messages on a remote ownCloud instance and let you read your messages from it.
diff --git a/res/values/strings.xml b/res/values/strings.xml
index 181fa2e..9da9e2c 100644
--- a/res/values/strings.xml
+++ b/res/values/strings.xml
@@ -26,6 +26,8 @@
  */
 -->
 <resources>
+	<!-- Translation version, reference for translators -->
+	<string name="translation_version">2</string>
 
 	<!-- System strings, do not translate -->
     <string name="app_name">ownCloud-SMS</string>