non-ascii mangling in emails

I got an email telling me that https://keybase.io/wsanchez ("Wilfredo Sánchez Vega") had tracked me, which referred to him as ("Wilfredo Sánchez Vega").

Start by reproducing the email about https://keybase.io/wsanchez with the name “Wilfredo Sánchez Vega,” then trace the notification email path responsible for rendering that name. Done means the accented name is delivered correctly rather than as “Sánchez”; the issue names no files or tests, so further project-specific entry points must be identified.

Written by the indexing model from the issue text.