[July 8th Meetup] Translate `library/venv.po`

[mattwang44]

### Tasks
- [ ] [Title & Intro](https://docs.python.org/3/library/venv.html#module-venv) (6)
- [x] [Creating virtual environments](https://docs.python.org/3/library/venv.html#module-venv) (18)
- [ ] [How venvs work](https://docs.python.org/3/library/venv.html#how-venvs-work) (12)
- [ ] [API](https://docs.python.org/3/library/venv.html#how-venvs-work) `venv.rst:140` to `venv.rst:218` (15)
- [ ] [API](https://docs.python.org/3/library/venv.html#how-venvs-work) `venv.rst:225` to `venv.rst:299` (18)
- [ ] [API](https://docs.python.org/3/library/venv.html#how-venvs-work) `venv.rst:287` to `venv.rst:581` & [An example of extending EnvBuilder](https://docs.python.org/3/library/venv.html#an-example-of-extending-envbuilder)(16)

[jacksonchen1998]

認領 Creating virtual environments (18)

[mattwang44]

認領 How venvs work

[maotingyang]

認領 Title & Intro (6)

[rockleona]

認領 API venv.rst:140 to venv.rst:218 (15)

[AbyssDrake]

認領ensurepip

[emily40830]

認領 API venv.rst:225 to venv.rst:299 (15)