Apply Style/CollectionMethods rubocop rule

We were already using `map` and `reduce` almost everywhere.

app/controllers/concerns/dashboard/group_supports.rb

@@ -15,7 +15,7 @@ module Dashboard::GroupSupports
 
     def accumulate_supports(grouped_votes)
       grouped_votes.each do |group, votes|
-        grouped_votes[group] = votes.inject(0) { |sum, vote| sum + vote.vote_weight }
+        grouped_votes[group] = votes.reduce(0) { |sum, vote| sum + vote.vote_weight }
       end
 
       accumulated = 0

app/controllers/concerns/remotely_translatable.rb

@@ -20,7 +20,7 @@ module RemotelyTranslatable
     end
 
     def resources_groups(*args)
-      feeds = args.detect { |arg| arg&.first.class == Widget::Feed } || []
+      feeds = args.find { |arg| arg&.first.class == Widget::Feed } || []
 
       args.compact - [feeds] + feeds.map(&:items)
     end