Add option to obfuscate domain name in public list of domain blocks (#15355)

- Replace the middle of the domain with * characters (except for periods)
- Add SHA-256 digest of the domain name in tooltip

config/locales/en.yml

@@ -402,6 +402,8 @@ en:
           silence: Silence
           suspend: Suspend
         title: New domain block
+      obfuscate: Obfuscate domain name
+      obfuscate_hint: Partially obfuscate the domain name in the list if advertising the list of domain limitations is enabled
       private_comment: Private comment
       private_comment_hint: Comment about this domain limitation for internal use by the moderators.
       public_comment: Public comment