l10n: pl.po: add translation and set team leader

Signed-off-by: Arusekk <arek_koz@o2.pl>

Author: Arusekk

po/TEAMS

@@ -42,6 +42,10 @@ Leader:		Gwan-gyeong Mun <elongbug@gmail.com>
 Members:	Changwoo Ryu <cwryu@debian.org>
 		Sihyeon Jang <uneedsihyeon@gmail.com>
 
+Language:	pl (Polish)
+Repository:	https://github.com/Arusekk/git-po
+Leader:		Arusekk <arek_koz@o2.pl>
+
 Language:	pt_PT (Portuguese - Portugal)
 Repository:	https://github.com/git-l10n-pt-PT/git-po/
 Leader:		Daniel Santos <hello@brighterdan.com>