Import revised translations

Change-Id: I5a21c3e0f13c46d44e4fcc09641c7e8c1589975c
diff --git a/res/values-es/strings.xml b/res/values-es/strings.xml
index c1e633a..622306d 100644
--- a/res/values-es/strings.xml
+++ b/res/values-es/strings.xml
@@ -19,7 +19,7 @@
     <string name="app_name" msgid="8396461461738434341">"Servicios SIM"</string>
     <string name="menu_end_session" msgid="7368541737750982217">"Finalizar sesión"</string>
     <string name="help" msgid="9209980881219397319">"Ayuda"</string>
-    <string name="menu_back" msgid="301227740977453364">"Anterior"</string>
+    <string name="menu_back" msgid="301227740977453364">"Atrás"</string>
     <string name="service_name" msgid="6860303747999592491">"Nombre de servicio"</string>
     <string name="stk_no_service" msgid="5427773116839809131">"Ningún servicio disponible"</string>
     <string name="button_ok" msgid="5760722312558549555">"Aceptar"</string>