/usr/share/geany/templates/ is in geany-common 1.23.1+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/geany/templates/bsd
/usr/share/geany/templates/changelog
/usr/share/geany/templates/fileheader
/usr/share/geany/templates/files/
/usr/share/geany/templates/files/file.html
/usr/share/geany/templates/files/file.php
/usr/share/geany/templates/files/file.rb
/usr/share/geany/templates/files/file.tex
/usr/share/geany/templates/files/main.c
/usr/share/geany/templates/files/main.cxx
/usr/share/geany/templates/files/main.d
/usr/share/geany/templates/files/main.java
/usr/share/geany/templates/files/main.py
/usr/share/geany/templates/files/main.vala
/usr/share/geany/templates/files/program.pas
/usr/share/geany/templates/function
/usr/share/geany/templates/gpl