Security error bypass strings cleanup

This modernizes/makes some small improvements to some page info and
connection details dialog strings for when a user has bypassed security
warnings and when we can't verify the identity of a page.

Old strings:
- Android: https://screenshot.googleplex.com/47CauoGK8GDciv9.png
- Desktop: https://screenshot.googleplex.com/RWQzqj4HWCTney7.png

New strings:
- Android: https://screenshot.googleplex.com/3UD6NbJBNJAqkn5.png
- Desktop: https://screenshot.googleplex.com/8bgyUxSp27DWjir.png

Bug: 1218526
Change-Id: I6450c46e77a4d72dcd39e70d044b69bbdf37dc05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3152060
Auto-Submit: Chris Thompson <cthomp@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/main@{#920345}