I suggest to:
  1) remove the alias for tactis;
  2) add the aliases for latin_* and the tests for the aliases;
  3) fix the email.charset to use the new aliases instead of its own dict.

2) and 3) should go on 3.3 only, 1) could be considered a bug and fixed on 2.7/3.2 too, but since the codec is already missing, removing the alias won't change anything (i.e. it will raise a LookupError with or without alias).