[Desktop] Update labels on "Learn more" view of shields to match recent changes

[LaurenWags]

Description

On the "Learn more" view of shields, some of the older labels are being used (ex. cross-site trackers blocked). This was recently changed to be more like standard/aggressive/disabled. We may want to update this view to match the label changes.

@brave/design should determine which labels to use and if others aside from the trackers & ads one needs to be updated. Note, logged #10670 for the blank FP label separately.

Steps to Reproduce

1. Navigate to a site
2. Click on shields
3. If not already on simple view, click on link for Simple View
4. Click on "Learn more" link in the middle of the panel.

Actual result:

See old "cross-site trackers blocked" label

Expected result:

See more updated label, like if you open the Advanced view:

Reproduces how often:

easily

Brave version (brave://version info)

Brave	1.11.92 Chromium: 84.0.4147.68 (Official Build) dev (64-bit)
Revision	e7b7234037639b407e69c5428c891ce018cd6c0d-refs/branch-heads/4147@{#772}
OS	macOS Version 10.14.6 (Build 18G3020)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a, 1.10.x does not have new labels
• Can you reproduce this issue with the beta channel? yes, 1.11.x
• Can you reproduce this issue with the dev channel? yes, 1.11.x
• Can you reproduce this issue with the nightly channel? unsure, probably

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields?
• Does the issue resolve itself when disabling Brave Rewards?
• Is the issue reproducible on the latest version of Chrome?

Miscellaneous Information:

cc @rebron @pes10k @brave/legacy_qa

[LaurenWags]

Verified passed with

Brave | 1.12.99 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
-- | --
Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | macOS Version 10.14.6 (Build 18G3020)

• Verified STR from description

---

Verification passed on

Brave | 1.12.99 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
-- | --
Revision | 19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS | Windows 10 OS Version 1903 (Build 18362.959)

• Verified STR from the description
  
  

---

Verification passed on

Brave	1.12.102 Chromium: 84.0.4147.89 (Official Build) dev (64-bit)
Revision	19abfe7bcba9318a0b2a6bc6634a67fc834aa592-refs/branch-heads/4147@{#852}
OS	Ubuntu 18.04 LTS

• Verified test plan from the description