A lot :)

app/views/reports/_report.json.jbuilder

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 json.extract! report, :id, :name, :comment_html, :created_at, :updated_at
 json.url report_url(report, format: :json)

app/views/reports/index.json.jbuilder

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 json.array! @reports, partial: "reports/report", as: :report

app/views/reports/show.json.jbuilder

@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 json.partial! "reports/report", report: @report

app/views/reports/show.xlsx.axlsx

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 wb = xlsx_package.workbook
 wb.add_worksheet(name: "Erfolgskriterien") do |sheet|
   sheet.add_row SuccessCriterion.column_names
@@ -7,4 +9,4 @@ wb.add_worksheet(name: "Erfolgskriterien") do |sheet|
       sheet.add_row sc.attributes.values
     end
   end
-end
+end