Modifies certain Safety Check and Safe Browsing strings (1.15.x).

[mkarolin]

Fixes brave/brave-browser#11345
Uplift from #6699

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint, npm run gn_check)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Requested a security/privacy review as needed.
• Added appropriate QA labels (QA/Yes or QA/No) to the associated issue
• Added appropriate release note labels (release-notes/include or release-notes/exclude) to the associated issue
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[kjozwiak]

Restarting macOS via https://ci.brave.com/job/pr-brave-browser-maxk-fix-safe-browsing-text-1.15.x-macos/2/ using WIPE_WORKSPACE due to init failing as per https://ci.brave.com/job/pr-brave-browser-maxk-fix-safe-browsing-text-1.15.x-macos/1/execution/node/104/log/.

17:40:40  Error: Command 'vpython src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --num_threads=4 --bucket chromium-binary-patching/zucchini_testdata --recursive -d src/components/zucchini' returned non-zero exit status 1 in /Users/jenkins/jenkins/workspace/pr-brave-browser-maxk-fix-safe-browsing-text-1.15.x-macos
17:40:40  Hook 'vpython src/third_party/depot_tools/download_from_google_storage.py --no_resume --no_auth --num_threads=4 --bucket chromium-binary-patching/zucchini_testdata --recursive -d src/components/zucchini' took 13.04 secs

[mkarolin]

Restarted macOS with SKIP_INIT due to

#include "brave/vendor/bat-native-ledger/include/bat/ledger/public/interfaces/ledger.mojom-shared.h"
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1 error generated.

[kjozwiak]

Uplift into 1.15.x approved after deliberating with @brave/uplift-approvers. QA has also verified the PR on Nightly as per #6699 (comment).