Add translation for Public Timeline title

app/controllers/timeline_controller.rb

@@ -14,7 +14,7 @@ class TimelineController < ApplicationController
   end
 
   def public
-    @title = generate_title("Public Timeline")
+    @title = generate_title(t(".title"))
     paginate_timeline { |args| Answer.cursored_public_timeline(**args) }
   end
 

config/locales/controllers.en.yml

@@ -188,3 +188,6 @@ en:
     registrations:
       destroy:
         export_pending: "You may not delete your account while account data is currently being exported."
+  timeline:
+    public:
+      title: "Public Timeline"