Move the i18n loading to an initializer

Use after_initialize to avoid rails resetting the translations

app/controllers/site_controller.rb

@@ -107,7 +107,6 @@ class SiteController < ApplicationController
   end
 
   def communities
-    OsmCommunityIndex::LocalChapter.add_to_i18n # this should be called on app init
     @local_chapters = OsmCommunityIndex::LocalChapter.local_chapters
   end
 

config/initializers/osm_community_index.rb

@@ -0,0 +1,3 @@
+Rails.configuration.after_initialize do
+  OsmCommunityIndex::LocalChapter.add_to_i18n
+end