launcher: set preferred language list from system locale

launcher/cog-launcher.c

@@ -270,6 +270,8 @@ on_automation_started(WebKitWebContext *context, WebKitAutomationSession *sessio
 static void
 cog_launcher_startup(GApplication *application)
 {
+ const gchar *const *locales;
+
  G_APPLICATION_CLASS(cog_launcher_parent_class)->startup(application);
 
  /*
@@ -318,6 +320,24 @@ cog_launcher_startup(GApplication *application)
 
  g_object_set(self->shell, "device-scale-factor", s_options.device_scale_factor, NULL);
 
+ /* build Accept-Language from locale, filtering out encodings */
+ locales = g_get_language_names();
+ if (locales) {
+ guint i, n, length = g_strv_length((gchar **) locales);
+ gchar **languages = g_new0(gchar *, length);
+
+ for (n = 0, i = 0; locales[i]; i++) {
+ const gchar *lang = locales[i];
+ if (!strcmp(lang, "C") || !strcmp(lang, "POSIX") || strchr(lang, '.'))
+ continue;
+ languages[n++] = g_strdup(lang);
+ }
+
+ webkit_web_context_set_preferred_languages(cog_shell_get_web_context(self->shell),
+ (const gchar *const *) languages);
+ g_strfreev(languages);
+ }
+
  if (s_options.handler_map) {
  GHashTableIter i;
  void *key, *value;