Spanish translation

[anauta]

Taking the chinese translation as model, I've translated the strings.xml file into spanish:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="take_photo">Hacer foto</string>
    <string name="start_capture">Iniciar captura</string>
    <string name="stop_capture">Detener captura</string>
    <string name="imageViewDescription">Imagen a comparar</string>
    <string name="loadPictureButtonString">Cargar imagen</string>
    <string name="change_transparency_string">Cambiar transparencia</string>
    <string name="settings_menu_name">Configuración</string>
    <string name="textTransparencyString">Valor para la transparencia de la imagen\n0=transparente / 255=opaco</string>
    <string name="toastBadTransparency">La transparencia debe estar entre 0 (transparente) y 255 (opaco)</string>
    <string name="rotate_image_string">Rotar imagen</string>
    <string name="etTransLabel">Introducir transparencia\n0=transparente 1=opaco</string>
    <string name="etHint">0.5</string>
    <string name="capture_imagen_string">Tomar imagen</string>
    <string name="front_back_camera_string">Girar cámara</string>
    <string name="transparent_image">imagen transparente</string>
    <string name="image_v_flip">Giro V</string>
    <string name="image_h_flip">Giro H</string>
</resources>

I hope it's useful, great app!