/usr/share/xindy/lang/german/ is in xindy-rules 2.4-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xindy/lang/german/braille-utf8-lang.xdy
/usr/share/xindy/lang/german/braille-utf8-test.xdy
/usr/share/xindy/lang/german/braille-utf8.xdy
/usr/share/xindy/lang/german/din5007-latin1-lang.xdy
/usr/share/xindy/lang/german/din5007-latin1-test.xdy
/usr/share/xindy/lang/german/din5007-latin1.xdy
/usr/share/xindy/lang/german/din5007-utf8-lang.xdy
/usr/share/xindy/lang/german/din5007-utf8-test.xdy
/usr/share/xindy/lang/german/din5007-utf8.xdy
/usr/share/xindy/lang/german/din5007.xdy
/usr/share/xindy/lang/german/duden-latin1-lang.xdy
/usr/share/xindy/lang/german/duden-latin1-test.xdy
/usr/share/xindy/lang/german/duden-latin1.xdy
/usr/share/xindy/lang/german/duden-utf8-lang.xdy
/usr/share/xindy/lang/german/duden-utf8-test.xdy
/usr/share/xindy/lang/german/duden-utf8.xdy
/usr/share/xindy/lang/german/duden.xdy
/usr/share/xindy/lang/german/tex.xdy