Update TRANSLATORS (#4137)

conf/locale/TRANSLATORS

@@ -50,6 +50,7 @@ Nakao Takamasa <at.mattenn AT gmail DOT com>
 Natan Albuquerque <natanalbuquerque5 AT gmail DOT com>
 Odilon Junior <odilon DOT junior93 AT gmail DOT com>
 Richard Bukovansky <richard DOT bukovansky @ gmail DOT com>
+Rste Risafov <risafov AT lazy DOT com>
 Robert Nuske <robert DOT nuske AT web DOT de>
 Robin Hübner <profan AT prfn DOT se>
 SeongJae Park <sj38 DOT park AT gmail DOT com>