Maintenance: Improve translatable source strings.

app/models/system_report/plugin/os.rb

@@ -3,7 +3,7 @@
 class SystemReport::Plugin::Os < SystemReport::Plugin
   OS_RELEASE_FILE = '/etc/os-release'.freeze
 
-  DESCRIPTION = __('OS').freeze
+  DESCRIPTION = __('Operating system').freeze
 
   def fetch
     os_release.merge(platform: RUBY_PLATFORM).deep_symbolize_keys

i18n/zammad.pot

@@ -8997,10 +8997,6 @@ msgstr ""
 msgid "OK, I've saved my recovery codes"
 msgstr ""
 
-#: app/models/system_report/plugin/os.rb
-msgid "OS"
-msgstr ""
-
 #: app/assets/javascripts/app/controllers/import_otrs.coffee
 #: app/frontend/apps/desktop/pages/guided-setup/components/GuidedSetupImport/GuidedSetupImportSource/plugins/otrs.ts
 msgid "OTRS"
@@ -9211,6 +9207,10 @@ msgstr ""
 msgid "Opened in tabs"
 msgstr ""
 
+#: app/models/system_report/plugin/os.rb
+msgid "Operating system"
+msgstr ""
+
 #: app/assets/javascripts/app/views/agent_ticket_view/content.jst.eco
 #: app/assets/javascripts/app/views/channel/chat.jst.eco
 #: app/assets/javascripts/app/views/channel/form.jst.eco