[Optimal Growth II] Update Translations

[nisha617]

This PR updates the translation in optgrowth_fast.md.

Here are two issues. We can merge this PR once we fix them.

• ImportError
• The following files cannot be found, so the corresponding comments cannot be translated into Chinese:

:load: _static/lecture_specific/optgrowth/cd_analytical.py

:load: _static/lecture_specific/optgrowth_fast/ogm.py

:load: _static/lecture_specific/optgrowth/solve_model.py

:load: _static/lecture_specific/optgrowth_fast/ogm_crra.py

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[HumphreyYang]

Hi @nisha617, you can find them in the folder:

https://github.com/QuantEcon/lecture-python.zh-cn/tree/main/lectures/_static/lecture_specific/optgrowth

Let me know if you have trouble finding them.