Add placeholder form component for last modified value
Implement test to verify that speed limit modifier field is displayed
Display modified by value on speed limit form
Move generate function outside returned object in speed limits test data
Define default speed limit constructor in speed limit test data
Fix indentation
Return detailed information for speed limit in test data
Add modified by to one speed limit in test data
Add modified by to speed limit detailed information in backend
Move update speed limit backend call to backend utils
Enable mocking of speed limit update
Remove obsolete function
Update modified by field when speed limit is saved
Remove obsolete function
Return speed limit value from backend in update call