remove duplicate properties keys

[stevenferey]

What this PR does / why we need it:

Remove duplicate property keys from property files

Which issue(s) this PR closes:

Closes #9169

Special notes for your reviewer:

Suggestions on how to test this:

Does this PR introduce a user interface change? If mockups are available, please link/include them here:

Is there a release notes update needed for this change?:

No

Additional documentation: