Add date to the content

[mleppla]

User Story

As a:

student / teacher

I want:

I like to see when the content was published

so that:

So I can have an additional information when the exercise/ content is published

Acceptance criteria:

• add the publish date of the content to the teacher area
• add the publish date of the content to the students area

Additional info:

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Please tag this issue if you are sure to which tag(s) it belongs.

[PatrickSkowronek]

Maybe add which teacher add this content.