adding pdf and image viewer

static/locales/en.json

@@ -18,6 +18,7 @@
     "move": "Move to...",
     "move_to": "Move to",
     "delete": "Delete",
+    "download": "Download",
     "cancel": "Cancel",
     "confirm": "Confirm",
     "share": "Share",
@@ -243,5 +244,12 @@
     "admin_password": "Admin password",
     "create_admin": "Create administrator",
     "back_to_login": "Already set up?"
+  },
+  "viewer": {
+    "unsupported_file": "This file type cannot be previewed.",
+    "download_file": "Download file",
+    "zoom_in": "Zoom in",
+    "zoom_out": "Zoom out",
+    "zoom_reset": "Reset zoom"
   }
 }

static/locales/es.json

@@ -137,6 +137,7 @@
     "move": "Mover a...",
     "move_to": "Mover a",
     "delete": "Eliminar",
+    "download": "Descargar",
     "cancel": "Cancelar",
     "confirm": "Confirmar",
     "share": "Compartir",
@@ -243,5 +244,12 @@
     "admin_password": "Contraseña administrador",
     "create_admin": "Crear administrador",
     "back_to_login": "¿Ya está configurado?"
+  },
+  "viewer": {
+    "unsupported_file": "Este tipo de archivo no se puede previsualizar.",
+    "download_file": "Descargar archivo",
+    "zoom_in": "Acercar",
+    "zoom_out": "Alejar",
+    "zoom_reset": "Restablecer zoom"
   }
 }