Hi,
I was searching for a way to add additional dictionaries to my collabora online docker installation.
I only found parts of tutorials and most of them where for a non-docker installation.
So I looked into it and wrote a complete tutorial + scripts for install and update.
Here you can find it on github:
I am not a “pro bash scripter”.
I just want to make collabora online as easy available as possible for people who are not speaking german, english, france, italian, portuguese, russian or spanish.
Then yes, there are much more languages in the world 
If you have any improvements please share it with me! As I said, i am not a pro