diff --git a/script/i18n/rewrite_crowdin_yml_files b/script/i18n/rewrite_crowdin_yml_files
new file mode 100755
index 00000000000..9f40e64f16b
--- /dev/null
+++ b/script/i18n/rewrite_crowdin_yml_files
@@ -0,0 +1,59 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+#-- copyright
+# OpenProject is an open source project management software.
+# Copyright (C) the OpenProject GmbH
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See COPYRIGHT and LICENSE files for more details.
+#++
+
+require "stringio"
+require "tempfile"
+require "yaml"
+
+crowdin_yml_files = Dir.glob("{,modules/*/}config/locales/crowdin/*.yml")
+
+rewritten_count = crowdin_yml_files.count do |path|
+  content = File.read(path)
+  comments = content.lines.take_while { it.start_with?("#") }
+  data = YAML.safe_load(content, permitted_classes: [Symbol])
+
+  rewritten_content = StringIO.open do |io|
+    io.puts comments
+    YAML.dump(data, io)
+
+    io.string
+  end
+
+  next if rewritten_content == content
+
+  Tempfile.create(File.basename(path), File.dirname(path)) do |tmp|
+    tmp.write(rewritten_content)
+    tmp.close
+    File.rename(tmp.path, path)
+  end
+end
+
+puts "Rewrote #{rewritten_count} crowdin YAML files"