Changing Display Name does not refresh Last Modified By

Describe the bug
If you change the Display Name of a User and then go back to a page that was last edited by that, user the old name still appears. This is not getting refreshed.

To Reproduce
Steps to reproduce the behavior:

1. Go to Admin section.
2. Go to Users aub-section.
3. Select a User.
4. Edit the Display Name for that User.
5. Save the edit by clicking the Update User button on that page.
6. Visit any page that was last edited by that user. The old Display Name appears.

Expected behavior
The Display Name of the last edited by user will appear with their current Display Name. This is important as many users will have lots of pages last edited by Administrator, and then now with beta 268, we can change the Display Name of the Administrator to a person's real name.

Screenshots
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Host Info (please complete the following information):

• OS: Ubuntu 19.04
• Wiki.js version: 2.0.0-beta.268
• Database engine: postgres

Additional context
Add any other context about the problem here.