[Task]: Fix post-merge comments about the blocked pages

[willdurand]

Description

See: https://github.com/mozilla/addons-frontend/pull/13285

Acceptance Criteria

### Milestones/checkpoints
- [x] Fix l10n strings
- [x] Add selector

Checks

• [X] If I have identified that the work is specific to a repository, I have removed "repository:addons-server" or "repository:addons-frontend"

┆Issue is synchronized with this Jira Task

[ioanarusiczki]

Going to https://addons-dev.allizom.org/en-US/firefox/blocked-addon/%7B21ea20de-9707-4b2a-8f8f-ca2e8c9e8bba%7D/ or other pages , Mozilla's Add-on Policies is no longer with capital letters