+void
+checked_set(LanguageTagWidget* widget, dcp::LanguageTag value)
+{
+ if (widget->get() != value) {
+ widget->set(value);
+ }
+}
+
+
+void
+checked_set(LanguageTagWidget* widget, optional<dcp::LanguageTag> value)
+{
+ if (widget->get() != value) {
+ widget->set(value);
+ }
+}
+
+
+void
+checked_set(RegionSubtagWidget* widget, optional<dcp::LanguageTag::RegionSubtag> value)
+{
+ if (widget->get() != value) {
+ widget->set(value);
+ }
+}
+
+
+#ifdef DCPOMATIC_OSX
+
+void
+dcpomatic_setup_i18n()
+{
+ wxLog::EnableLogging();
+
+ auto get_locale_value = [](CFLocaleKey key) {
+ CFLocaleRef cflocale = CFLocaleCopyCurrent();
+ auto value = (CFStringRef) CFLocaleGetValue(cflocale, key);
+ char buffer[64];
+ CFStringGetCString(value, buffer, sizeof(buffer), kCFStringEncodingUTF8);
+ CFRelease(cflocale);
+ return string(buffer);
+ };
+
+ auto translations = new wxTranslations();
+
+ auto config_lang = Config::instance()->language();
+ if (config_lang && !config_lang->empty()) {
+ translations->SetLanguage(std_to_wx(*config_lang));
+ } else {
+ /* We want to use the user's preferred language. It seems that if we use the wxWidgets default we will get the
+ * language for the locale, which may not be what we want (e.g. for a machine in Germany, configured for DE locale,
+ * but with the preferred language set to English).
+ *
+ * Instead, the the language code from macOS then get the corresponding canonical language string with region,
+ * which wxTranslations::SetLanguage will accept.
+ */
+ auto const language_code = get_locale_value(kCFLocaleLanguageCode);
+ /* Ideally this would be wxUILocale (as wxLocale is deprecated) but we want to keep this building
+ * with the old wxWidgets we use for the older macOS builds.
+ */
+ auto const info = wxLocale::FindLanguageInfo(std_to_wx(language_code));
+ if (info) {
+#if wxCHECK_VERSION(3, 1, 6)
+ translations->SetLanguage(info->GetCanonicalWithRegion());
+#else
+ translations->SetLanguage(info->CanonicalName);
+#endif
+ }
+ }
+
+#ifdef DCPOMATIC_DEBUG
+ wxFileTranslationsLoader::AddCatalogLookupPathPrefix(wxT("build/src/wx/mo"));
+ wxFileTranslationsLoader::AddCatalogLookupPathPrefix(wxT("build/src/tools/mo"));
+#endif
+
+ translations->AddStdCatalog();
+ translations->AddCatalog(wxT("libdcpomatic2-wx"));
+ translations->AddCatalog(wxT("dcpomatic2"));
+
+ wxTranslations::Set(translations);
+
+ dcpomatic_setup_gettext_i18n(config_lang.get_value_or(""));
+}
+
+#else
+