fix(wildlife): point the Acartia card link only at acartia.io

The card's "Acartia" link was built from the contributor-supplied
photo_url, so any https site could appear labelled as Acartia. Acartia
has no documented per-sighting page, so the source link is now always
the Acartia site, on the server projection and again in the card.
The separate "Open on Acartia" fallback link is no longer needed.

src/i18n/locales/es.json

@@ -3228,7 +3228,6 @@
   "Loading photo...": "Cargando foto…",
   "Photo unavailable": "Foto no disponible",
   "Location obscured to a 0.2° cell": "Ubicación oculta en una celda de 0,2°",
-  "Open on Acartia ↗": "Abrir en Acartia ↗",
   "Photo of {name}": "Foto de {name}",
   "Acartia": "Acartia",
   "CC BY 4.0": "CC BY 4.0",