Requested adblocker l10n changes

[maureenlholland]

If this changeset needs to go into the FXC codebase, please add the WMO and FXC label.

One-line summary

Final polish on the adblocker updates: #15959
l10n requested changes here: mozilla-l10n/www-l10n#473 (review)

Testing

You might need to set Dev=False in your .env to see the older version of the page.

http://localhost:8000/en-US/firefox/features/adblocker/

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 79.60%. Comparing base (639a535) to head (9534f7a).
Report is 13 commits behind head on main.

Files with missing lines	Patch %	Lines
bedrock/firefox/views.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15974   +/-   ##
=======================================
  Coverage   79.60%   79.60%           
=======================================
  Files         160      160           
  Lines        8410     8410           
=======================================
  Hits         6695     6695           
  Misses       1715     1715           

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[wen-2018]

r+