Brave Shields alt text is confusing to users

Description

Users correctly assume that the block count on Brave Shields is the ads that were blocked. However, the irrelevant alt text causes unnecessary confusion about what the feature is. Update the alt text to something more helpful.

Steps to Reproduce

1. Hover over Brave Shields to get the alt text

Actual result:

Expected result:

Alt text should show: Brave Shields X Trackers, ads, and more blocked

Reproduces how often:

Easily

Brave version (brave://version info)

All versions

Version/Channel Information:

• Can you reproduce this issue with the current release? yes
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the nightly channel? yes

Other Additional Information:

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

Miscellaneous Information:

[jenn-rhim]

the tooltip text should be separated into 2 lines: first line - feature name, and the 2nd line - description.

Filed https://github.com/brave/brave-browser/issues/21943

[karenkliu]

@Tonev That definitely sounds like a worthwhile improvement! We would appreciate it if you could file a separate issue describing your problem and proposed solution.