My installation doesn't have a /share directory, so the error makes sense.
It sounds like the package you used is broken. If your `geany` binary is in, say, `/usr/bin` the `geany.glade` file needs to go into `/usr/share/geany`.
Is there a way to solve this? How?
Geany is pretty easy to compile from source and it will get you the current version instead of one from early last year.