Add 'replace' file feature for press/journal media managers

[severett89]

Is your feature request related to a problem? Please describe.
A button to replace an already uploaded file on the media managers for press and journal levels does not exist meaning that you must delete and re upload the new file with an identical name to preserve any external linking to it.

Describe the solution you'd like
Add a button.

Describe alternatives you've considered
There is no alternative.

[joemull]

Thank you @severett89 -- I actually put in an issue for this back in March: #4001