Use switch_locale instead of I18n.with_locale directly

app/controllers/concerns/submission_scoring.rb

@@ -4,11 +4,9 @@ require 'concurrent/future'
 
 module SubmissionScoring
   def collect_test_results(submission)
-    current_locale = I18n.locale
     # Mnemosyne.trace 'custom.codeocean.collect_test_results', meta: { submission: submission.id } do
     futures = submission.collect_files.select(&:teacher_defined_assessment?).map do |file|
       Concurrent::Future.execute do
-        I18n.with_locale(current_locale) do
         # Mnemosyne.trace 'custom.codeocean.collect_test_results_block', meta: { file: file.id, submission: submission.id } do
         assessor = Assessor.new(execution_environment: submission.execution_environment)
         output = execute_test_file(file, submission)
@@ -37,18 +35,17 @@ module SubmissionScoring
           LinterCheckRun.create_from(testrun, assessment)
           switch_locale do
             assessment = assessor.translate_linter(assessment, I18n.locale)
-            end
 
             # replace file name with hint if linter is not used for grading. Refactor!
             filename = t('exercises.implement.not_graded') if file.weight.zero?
           end
+        end
 
         output.merge!(assessment)
         output.merge!(filename: filename, message: feedback_message(file, output), weight: file.weight)
         # end
       end
     end
-    end
     futures.map(&:value)
   end
 

app/controllers/submissions_controller.rb

@@ -366,16 +366,13 @@ class SubmissionsController < ApplicationController
 
       # the score_submission call will end up calling docker exec, which is blocking.
       # to ensure responsiveness, we therefore open a thread here.
-      current_locale = I18n.locale
       Thread.new do
-        I18n.with_locale(current_locale) do
         tubesock.send_data JSON.dump(score_submission(@submission))
 
         # To enable hints when scoring a submission, uncomment the next line:
         # send_hints(tubesock, StructuredError.where(submission: @submission))
 
         tubesock.send_data JSON.dump({'cmd' => 'exit'})
-        end
       ensure
         ActiveRecord::Base.connection_pool.release_connection
       end