/usr/share/kopano-webapp/client/tinymce-languages/ is in kopano-webapp-common 3.4.6+dfsg1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kopano-webapp/client/tinymce-languages/bg_BG.js
/usr/share/kopano-webapp/client/tinymce-languages/ca.js
/usr/share/kopano-webapp/client/tinymce-languages/cs_CZ.js
/usr/share/kopano-webapp/client/tinymce-languages/da.js
/usr/share/kopano-webapp/client/tinymce-languages/de.js
/usr/share/kopano-webapp/client/tinymce-languages/el.js
/usr/share/kopano-webapp/client/tinymce-languages/en_GB.js
/usr/share/kopano-webapp/client/tinymce-languages/es.js
/usr/share/kopano-webapp/client/tinymce-languages/et.js
/usr/share/kopano-webapp/client/tinymce-languages/fa_IR.js
/usr/share/kopano-webapp/client/tinymce-languages/fi.js
/usr/share/kopano-webapp/client/tinymce-languages/fr_FR.js
/usr/share/kopano-webapp/client/tinymce-languages/he_IL.js
/usr/share/kopano-webapp/client/tinymce-languages/hr.js
/usr/share/kopano-webapp/client/tinymce-languages/hu_HU.js
/usr/share/kopano-webapp/client/tinymce-languages/it.js
/usr/share/kopano-webapp/client/tinymce-languages/ja.js
/usr/share/kopano-webapp/client/tinymce-languages/ko_KR.js
/usr/share/kopano-webapp/client/tinymce-languages/lt.js
/usr/share/kopano-webapp/client/tinymce-languages/nb_NO.js
/usr/share/kopano-webapp/client/tinymce-languages/nl.js
/usr/share/kopano-webapp/client/tinymce-languages/pl.js
/usr/share/kopano-webapp/client/tinymce-languages/pt_BR.js
/usr/share/kopano-webapp/client/tinymce-languages/pt_PT.js
/usr/share/kopano-webapp/client/tinymce-languages/ru_RU.js
/usr/share/kopano-webapp/client/tinymce-languages/sl_SI.js
/usr/share/kopano-webapp/client/tinymce-languages/sv_SE.js
/usr/share/kopano-webapp/client/tinymce-languages/tr_TR.js
/usr/share/kopano-webapp/client/tinymce-languages/uk_UA.js
/usr/share/kopano-webapp/client/tinymce-languages/zh_CN.js
/usr/share/kopano-webapp/client/tinymce-languages/zh_TW.js