The OTRS admin manual can be translated via Transifex as described in the section on translating OTRS. You can join a language team on Transifex to improve an existing translation or even suggest a new language to translate the admin manual to.
It is important that the structure of the generated XML stays intact.
So if the original string is
then the German translation has to be
keeping the XML tags intact. Regular < and > signs that are escaped in the source text must also be escaped in the translations (like
Scripts and examples usually do not have to be translated (so you can just copy the source text to the translation text field in this case).