Anonymize the user email address in Feedback section

[jogendra]

Actual Behaviour

The feedback section currently shows complete email addresses.

Expected Behaviour

Anonymize the feedback and only show emails until the @ sign, e.g. "mariobehling@..".

Screenshots of the issue Current screens:

Skill Detail Screen	See All Feedback

Expected: (Web implemetation)

Would you like to work on the issue? Yes