Rename Site Settings to Site and Shields Settings in

[simonhong]

Shields settings are subset in Site settings.
So, Site Settings in settings page is renamed to Site and Shields Settings.

In brave://settings/privacy and Clear browsing data dialog, all the Site Settings title is renamed.

[GeetaSarvadnya]

Verification passed on

Brave	1.7.67 Chromium: 80.0.3987.149 (Official Build) beta (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Windows 10 OS Version 1803 (Build 17134.1006)

• Verified that Site Settings in settings page is renamed to Site and Shields Settings.
  
• Verified that Site Settings is renamed to Site and Shields Settings in clear browsing data dialog
  

Verification PASSED on macOS 10.15.3 x64 using the following build:

Brave | 1.7.71 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
-- | --
Revision | 5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS | macOS Version 10.15.3 (Build 19D76)

Verification passed on

Brave	1.7.71 Chromium: 80.0.3987.149 (Official Build) dev (64-bit)
Revision	5f4eb224680e5d7dca88504586e9fd951840cac6-refs/branch-heads/3987_137@{#16}
OS	Ubuntu 18.04 LTS