feat(i18n): add `open image preview dialog` spanish translation (#2839)

locales/es.json

@@ -73,6 +73,7 @@
     "favourited": "Marcado como favorita",
     "more": "Más",
     "next": "Siguiente",
+    "open_image_preview_dialog": "Abrir diálogo de vista previa de la imagen",
     "prev": "Anterior",
     "publish": "Publicar",
     "publish_thread": "Publicar hilo",