Hi Brian,
Thanks for your inquiry.
I am really sorry as currently we do not have this tutorial. I apologize for the inconvenience caused.
Regarding your issue, you need to have the mod_easydiscusswelcome.ini file in the other language. You can copy this file en-GB.mod_easydiscusswelcome.ini from English file and paste it in your other language. Next, you need to change the file prefix name "en-GB" follows the other file in the folder. Then, you can translate the language strings in this file. So, each time the language is change, the module language is change as well.
Hope I have explained this well.