Fixes #6108 - Attachment file size is wrong in the public KB answer

app/views/knowledge_base/public/answers/show.html.erb

@@ -18,7 +18,7 @@ data-available-locales="<%= @object_locales.map(&:locale).join(',') %>">
           <% attachments.each do |attachment| %>
             <%= link_to custom_path_if_needed(attachment_path(attachment), @knowledge_base), class: 'attachment', download: true do %>
               <span class="attachment-name u-highlight"><%= attachment.filename %></span>
-              <div class="attachment-size">404kb</div>
+              <div class="attachment-size"><%= number_to_human_size attachment.size %></div>
             <% end %>
           <% end %>
         </div>

config/locales/en.yml

@@ -31,3 +31,16 @@
 
 en:
   hello: "Hello world"
+  number:
+      human:
+        storage_units:
+          format: "%n %u"
+          units:
+            byte:
+              one: "B"
+              other: "B"
+            kb: "KB"
+            mb: "MB"
+            gb: "GB"
+            tb: "TB"
+            pb: "PB"

spec/system/knowledge_base_public/answer_spec.rb

@@ -125,6 +125,20 @@ RSpec.describe 'Public Knowledge Base answer', type: :system do
     end
   end
 
+  context 'attachments' do
+    before do
+      visit help_answer_path(locale_name, category, published_answer)
+    end
+
+    # Making sure it shows the shorthand.
+    # This way we can get away without translating Byte(s).
+    it 'shows an associated attachment' do
+      expect(page)
+        .to have_css('.attachment-size', text: '12 B')
+        .and(have_no_css('.attachment-size', text: 'Byte'))
+    end
+  end
+
   def open_answer(answer, locale: primary_locale.system_locale.locale)
     visit help_answer_path(locale, answer.category, answer)
   end