games/py-mnemosyne-proj: Update to 2.11

- Rename to match PyPI name
- Switch to DISTVERSION
- Switch to pep517 build
- Remove run dependency on textproc/py-googletrans as upstream changed
  it to a new and optional dependency, not ported yet (google-trans-new)

ChangeLog:	https://mnemosyne-proj.org/whats-new
PR:		274972