Add (currently unused) setting for default quote policy (#34623)

config/locales/en.yml

@@ -1859,6 +1859,10 @@ en:
       limit: You have already pinned the maximum number of posts
       ownership: Someone else's post cannot be pinned
       reblog: A boost cannot be pinned
+    quote_policies:
+      followers: Followers and mentioned users
+      nobody: Only mentioned users
+      public: Everyone
     title: '%{name}: "%{quote}"'
     visibilities:
       direct: Direct