/usr/share/myspell/dicts/hyph_de_CH.dic is in hyphen-de 1:4.2.1-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hyphen/hyph_de_DE.dic
/usr/share/myspell/dicts/../../hyphen/hyph_de_DE.dic