[QA] nautilus integration menu missing, when username contains special characters

[jnweiger]

Pre-submission Checks

• [X] I checked for similar issues, but could not find any. I also checked the closed issues. I could not contribute additional information to any existing issue.
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Describe the QA issue

Seen with owncloud core 10.13.1-rc.1 and testpilotcloud client 4.1.0.11251 279a6f

• Admin create user carol with full name Carol L€wis - including a € character.
• User carol connects desktop client, navigates to the documents using a file browser, and right-clicks on Example.odt
• The context menu misses the owncloud entry. BAD

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• another user einstein without special characters gets the menu correctly:

Steps to reproduce the issue

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Screenshots

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Expected behavior

Special characters should not matter.

Actual behavior

No response