Fixes Norwegian localization for shields and rewards.

[mkarolin]

Fixes brave/brave-browser#3425
Uplift request from #2709

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)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• 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-Protection-Mode
  • 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]

Uplift into 0.66.x approved after going through #2709 (comment). Please ensure that the correct labels are being used and that the appropriate issue is moved into the correct milestone.

[kjozwiak]

@mkarolin can you take a look at the following conflicts before merging into 0.66.x?:

* components/brave_extension/extension/brave_extension/_locales/nb/messages.json
* components/brave_rewards/resources/extension/brave_rewards/_locales/nb/messages.json

[kjozwiak]

Uplift into 0.66.x approved. Went through #2709 (comment) and ensured that the PR was working on 0.68.57 Chromium: 75.0.3770.90. Please make sure that all the labels are correctly being used and that the appropriate issue is moved into the correct milestone.

Checked the Jenkins failures, looks like it's lint issues and failure to upload xUnit report. Should be safe to uplift 👍