Add myself to TRANSLATORS (#3415)

Author: kaz

options/locale/TRANSLATORS

@@ -38,6 +38,7 @@ Joel da Rosa <webjoel AT hotmail DOT com>
 Joubert RedRat <me+github AT redrat DOT com DOT br>
 Jonathan Lozada De La Matta <jlozada2426 AT protonmail DOT com>
 Juraj Bubniak <contact AT jbub DOT eu>
+Kazuki Sawada <kazuki AT 6715 DOT jp>
 Lafriks <lafriks AT gmail DOT com>
 Lauri Ojansivu <x AT xet7 DOT org>
 Luc Stepniewski <luc AT stepniewski DOT fr>