Add comments count component

Remove all the translations that are left over after having unified them
in the component.

app/components/shared/comments_count_component.rb

@@ -0,0 +1,12 @@
+class Shared::CommentsCountComponent < ApplicationComponent
+  attr_reader :comments_count, :url
+
+  def initialize(comments_count, url: nil)
+    @comments_count = comments_count
+    @url = url
+  end
+
+  def text
+    t("shared.comments", count: comments_count)
+  end
+end