Using NIST supported language: 'Allowlist'

[cwmoriarty]

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• I have read the contributing guide lines at https://github.com/opnsense/core/blob/master/CONTRIBUTING.md
• I am convinced that my issue is new after having checked both open and closed issues at https://github.com/opnsense/core/issues?q=is%3Aissue

Is your feature request related to a problem? Please describe.

Unbound Plugin uses whitelist (iffy language) and blocklists (good language).

As far as I can tell, upstream use whitelist and blacklist, so Opnsense has already addressed half of the issue. :)

Describe the solution you like

Replace UI and variable references to Whitelist with Allowlist. I'm happy to contribute, test, and write PRs.

Additional context

https://www.nist.gov/nist-research-library/nist-technical-series-publications-author-instructions#inclusive
https://www.splunk.com/en_us/blog/learn/blacklist-whitelist-inclusivity.html

[fichtner]

If you want to try a PR please do and ping me for review.

[cwmoriarty]

Thanks @fichtner -- Created 8305. I've been able to use the feature (allowlist) as expected on my OPNsense 25.1.r_38-amd64 system.