Add new admin option to customize terms of use for file download

[samuelwei]

Implements #1435

Type (Highlight the corresponding type)

• Bugfix
• Feature
• Documentation
• Refactoring (e.g. Style updates, Test implementation, etc.)
• Other (please describe):

Checklist

• Code updated to current develop branch head
• Passes CI checks
• Is a part of an issue
• Tests added for the bugfix or newly implemented feature, describe below why if not
• Changelog is updated
• Documentation of code and features exists

Changes

• Add new admin option to customize terms of use for file download

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.35%. Comparing base (df88958) to head (9c44431).
Report is 19 commits behind head on develop.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #1440      +/-   ##
=============================================
+ Coverage      95.32%   95.35%   +0.02%     
  Complexity      1323     1323              
=============================================
  Files            203      203              
  Lines           4579     4583       +4     
=============================================
+ Hits            4365     4370       +5     
+ Misses           214      213       -1     

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[cypress]

PILOS    Run #809

Run Properties:   Passed #809  •  e54af954ef: Add new admin option to customize terms of use for file download (#1440)

Project	PILOS
Run status	Passed #809
Run duration	03m 01s
Commit	e54af954ef: Add new admin option to customize terms of use for file download (#1440)
Committer	Samuel Weirich
View all properties for this run ↗︎

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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	46