po/TEAMS: add new members to German translation team

Signed-off-by: Ralf Thielow <ralf.thielow@gmail.com>

po/TEAMS

@@ -15,6 +15,8 @@ Leader:		Ralf Thielow <ralf.thielow@googlemail.com>
 Members:	Thomas Rast <tr@thomasrast.ch>
 		Jan Krüger <jk@jk.gs>
 		Christian Stimming <stimming@tuhh.de>
+		Phillip Szelat <phillip.szelat@gmail.com>
+		Matthias Rüster <matthias.ruester@gmail.com>
 
 Language:	fr (French)
 Repository:	https://github.com/jnavila/git