(1) Fix wording and parameters in sentence: "You are receiving this e-mail because you signed up as a translator to [Your notified language(s)] on SITENAME." (list of localised language names). If not notified about all signed up languages, then only the matched languages from Special:TranslatorSignup should be added.
(2) Change link part: language=FirstMatchedNotifiedLanguageCode. If one is signed up for German, French and Spanish, and French and Spanish are notified, then two links should be added in the e-mail; one to French, one to Spanish (listed with * prefix?).
(3) Signature should be changed. Currently says "SITENAME staff". This should be "SITENAME translation administrators".
(4) For talk page messages, a timestamp should be added after "SITENAME translation administrators".
Input from bug triage.
Version: unspecified
Severity: major