Creating a patch of translation

Added by C S 29 days ago

I would like to be more active in helping translate Redmine.
So I translated the wiki help in #35613 and uploaded it as an html file. However, this should preferably be submitted as a patch file. The help in the wiki patch is not sufficient for me here. I run Redmine as a Docker file on a Synology NAS and therefore have only limited access to the operating system it contains.
Is there a more detailed guide on how I can create a compliant patch file from the html?