Update proofreader.md: add Daniel Ziegenberg
What does this MR do and why?
I request proofreader permissions for the german language, to be able to approve proposed translations in Crowdin.
I have no links to any projects I have previously translated other than those in my Crowdin Profile: https://crowdin.com/profile/ziegenberg
Screenshots or screen recordings
Not applicable.
How to set up and validate locally
Not applicable.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.