Support for Exercises directive & Added Chinese translation (zh_CN)

[11Haoyu]

• support for exercise directive
• add translation to Chinese
• change encoding to "utf8" in the _convert.py to be compatible more languages
• translation json for exercise directive
• pre-commit runs
  to modify formats

Co-authored-by: Ming Yang vivym@live.com

[11Haoyu]

This is my first time to contribute. I am not familiar with the procedure at first. Now I get it. If there's more additional directives, please keep me posted to add corresponding Chinese translation. Thank you so much!

[codecov-commenter]

Codecov Report

Base: 96.13% // Head: 96.17% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (7d0e596) compared to base (d37495f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   96.13%   96.17%   +0.04%     
==========================================
  Files           6        6              
  Lines         362      366       +4     
==========================================
+ Hits          348      352       +4     
  Misses         14       14              

Flag	Coverage Δ
pytests	96.17% <100.00%> (+0.04%)	⬆️

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Impacted Files	Coverage Δ
sphinx_proof/nodes.py	93.63% <100.00%> (+0.11%)	⬆️
sphinx_proof/proof_type.py	100.00% <100.00%> (ø)
sphinx_proof/translations/_convert.py	93.33% <100.00%> (ø)

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[mmcky]

thanks @11Haoyu -- you've done well for a first contribution. Thank you! I will review this over the next couple of days and get this merged.

[mmcky]

@11Haoyu we actually have another extension sphinx-exercise that has support for exercise and solution directives. Rather than just a styling admonition they are linked via references so you can reference an exercise directive from a solution etc. You can also reference the exercise in the text.

Maybe you can check that out to see if it meets your needs for exercise styling.

[11Haoyu]

Yes, I am aware of the extension of sphinx-exercise. But it seems that sphinx-exercise doesn't have translation function like sphinx-proof. Therefore, I added the exercise directive in sphinx-proof so people can use it in their own language. I would be so grateful if you can add translation in the sphinx-exercise as well, which is a very challenging task for me to write one from scratch.

[mmcky]

Yes, I am aware of the extension of sphinx-exercise. But it seems that sphinx-exercise doesn't have translation function like sphinx-proof. Therefore, I added the exercise directive in sphinx-proof so people can use it in their own language. I would be so grateful if you can add translation in the sphinx-exercise as well, which is a very challenging task for me to write one from scratch.

I see thanks @11Haoyu that makes sense.

[mmcky]

I will need to think a bit about the exercise node as that may cause conflict for those using sphinx-exercise in the same project. If we enable basic exercise support in this extension (while we get more support for multi language in sphinx-exercise executablebooks/sphinx-exercise#13) then we may need to rename the node to avoid conflicts. Let me think about this for a day or so.

[11Haoyu]

Yes, I understand that.

[mmcky]

thanks @11Haoyu for this PR. Greatly appreciated.

I have added your work via #137 and will look to add support to sphinx-exercise via executablebooks/sphinx-exercise#73