l10n #4457 update for Occitan language (#4483)

Previous and Next buttons

app/javascript/mastodon/locales/oc.json

@@ -94,8 +94,8 @@
   "home.column_settings.show_replies": "Mostrar las responsas",
   "home.settings": "Paramètres de la colomna",
   "lightbox.close": "Tampar",
-  "lightbox.next": "Next",
-  "lightbox.previous": "Previous",
+  "lightbox.next": "Seguent",
+  "lightbox.previous": "Precedent",
   "loading_indicator.label": "Cargament…",
   "media_gallery.toggle_visible": "Modificar la visibilitat",
   "missing_indicator.label": "Pas trobat",