Update messages_de_DE.properties

[Ludy87]

Description

Please provide a summary of the changes, including relevant motivation and context.

Closes #(issue_number)

Checklist:

• [ ] I have read the Contribution Guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] My changes generate no new warnings

Contributor License Agreement

By submitting this pull request, I acknowledge and agree that my contributions will be included in Stirling-PDF and that they can be relicensed in the future under the MPL 2.0 (Mozilla Public License Version 2.0) license.

(This does not change the general open-source nature of Stirling-PDF, simply moving from one license to another license)

[github-actions[bot]]

🚀 Translation Verification Summary

📋 Checking with the file messages_en_GB.properties from the main-branch - Checking the pr-branch

🗂️ Checking File: messages_de_DE.properties...

• Test 1 Status: ❌ Failed
  • Issue: Missing lines! Comments, empty lines, or translation strings are missing. Details: 1154 (reference) vs 1152 (current).
• Test 2 Status: ❌ Failed
  • Issue: There are keys in messages_de_DE.properties pdfPrompwt that are not present in messages_en_GB.properties!
  • Issue: There are keys in messages_en_GB.properties pdfPrompt, test1 that are not present in messages_de_DE.properties!

🚧 messages_de_DE.properties will be corrected...

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❌ Overall Check Status: Failed