Restore logic which is still necessary

app/domain/pbs/export/tabular/people/participation_nds_row.rb

@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+# Copyright (c) 2012-2023, Pfadibewegung Schweiz. This file is part of
+# hitobito_pbs and licensed under the Affero General Public License version 3
+# or later. See the COPYING file at the top-level directory or at
+# https://github.com/hitobito/hitobito_pbs.
+
+module Pbs::Export::Tabular::People::ParticipationNdsRow
+  extend ActiveSupport::Concern
+
+  included do
+    alias_method_chain :first_language, :language
+  end
+
+  def first_language_with_language
+    lang = entry.language.presence
+    lang ? lang.upcase : 'DE'
+  end
+end

lib/hitobito_pbs/wagon.rb

@@ -58,6 +58,9 @@ class Wagon < Rails::Engine
       Export::Tabular::People::ParticipationRow.include(
         Pbs::Export::Tabular::People::ParticipationRow
       )
+      Export::Tabular::People::ParticipationNdsRow.include(
+        Pbs::Export::Tabular::People::ParticipationNdsRow
+      )
       Export::Tabular::People::PersonRow.include Pbs::Export::Tabular::People::PersonRow
       Export::Tabular::People::PeopleAddress.include Pbs::Export::Tabular::People::PeopleAddress
       Export::Tabular::People::PeopleFull.include Pbs::Export::Tabular::People::PeopleFull

spec/domain/export/tabular/people/participation_nds_row_spec.rb

@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+# Copyright (c) 2012-2023, Pfadibewegung Schweiz. This file is part of
+# hitobito_pbs and licensed under the Affero General Public License version 3
+# or later. See the COPYING file at the top-level directory or at
+# https://github.com/hitobito/hitobito_pbs.
+
+require 'spec_helper'
+
+describe Export::Tabular::People::ParticipationNdsRow do
+
+  let(:participation) { Fabricate(:pbs_participation, person: person, event: events(:top_course)) }
+
+  let(:row) { described_class.new(participation) }
+
+  context 'with language' do
+    let(:person) { Fabricate(:person, language: 'it') }
+    it { expect(row.fetch(:first_language)).to eq 'IT' }
+  end
+
+  context 'without language' do
+    let(:person) { Fabricate(:person, language: nil) }
+    it { expect(row.fetch(:first_language)).to eq 'DE' }
+  end
+end