Comments were signed with the login name (or set_option author), with no way
to change it in the app. Preferences gains an Identity section whose name
field (labelled for screen readers) sets the author of new comments; it is
saved with the settings and restored (an empty name keeps the login-name
default; restored names are capped at 200 characters). Japanese labels
added. Test: identity.rs. Parity comment.author-identity: shipped.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>