system: add Portuguese to HEAD

src/www/system_general.php

@@ -47,6 +47,7 @@ function get_locale_list()
     $locales['de_DE'] = gettext('German');
     $locales['ja_JP'] = gettext('Japanese');
     $locales['mn_MN'] = gettext('Mongolian');
+    $locales['pt_BR'] = gettext('Portuguese');
     $locales['ru_RU'] = gettext('Russian');
     $locales['es_CO'] = gettext('Spanish');