locale: update TRANSLATORS (#4908)

conf/locale/TRANSLATORS

@@ -31,6 +31,7 @@ Dmitriy Nogay <me AT catwhocode DOT ga>
 Enrico Testori hypertesto AT gmail DOT com
 Ezequiel Gonzalez Rial <gonrial AT gmail DOT com>
 Farhan Naysee <wpmagic70 AT gmail DOT com>
+Flávio Monteiro <flaviomonteiro2013 AT gmail DOT com>
 Gabriel Dugny <gabriel DOT dugny AT gmail DOT com>
 Ganesha <reekoheek AT gmail DOT com>
 Gregor Santner <gdev AT live DOT de>