Feed improvements

And show public feed links on the group page

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/i18n/fr_FR.json

@@ -922,5 +922,8 @@
   "{profile} (by default)": "{profile} (par défault)",
   "{title} ({count} todos)": "{title} ({count} todos)",
   "{username} was invited to {group}": "{username} a été invité à {group}",
-  "© The OpenStreetMap Contributors": "© Les Contributeur⋅ices OpenStreetMap"
+  "© The OpenStreetMap Contributors": "© Les Contributeur⋅ices OpenStreetMap",
+  "Atom feed for events and posts": "Flux Atom pour les événements et les billets",
+  "ICS feed for events": "Flux ICS pour les événements",
+  "ICS/WebCal Feed": "Flux ICS/WebCal"
 }