Align project files with CodeHarbor

Since both projects are developed together and by the same team, we also want to have the same code structure and utility methods available in both projects. Therefore, this commit changes many files, but without a functional change.

spec/helpers/application_helper_spec.rb

@@ -2,7 +2,7 @@
 
 require 'rails_helper'
 
-describe ApplicationHelper do
+RSpec.describe ApplicationHelper do
   describe '#code_tag' do
     context 'with code' do
       let(:code) { 'puts 42' }
@@ -80,7 +80,7 @@ describe ApplicationHelper do
   end
 
   describe '#row' do
-    let(:html) { row(label: 'foo', value: 42) }
+    let(:html) { row(label: 'shared.show', value: 42) }
 
     it "builds nested 'div' tags" do
       expect(html).to have_css('div.attribute-row.row div.col-md-3 + div.col-md-9')