[FLINK-16097] Translate "SQL Client" page of "Table API & SQL" into Chinese

[XBaith]

What is the purpose of the change

This pull request translates "SQL Client" page into Chinese.

Verifying this change

This change is a docs work without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not applicable)

[XBaith]

Hi, @klion26. Thanks for your advises.
Could you please check this again?

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Last check on commit 66891d0 (Thu Apr 30 12:44:19 UTC 2020)

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[klion26]

@XBaith thanks for the contribution, I left some comments.

[XBaith]

@XBaith thanks for the contribution, I left some comments.

Thank you so much, Qiu Congxian (@klion26)! I have revised the translations base on your opinions.

[klion26]

@XBaith thanks for addressing my comments, I only have one little comment about adding the ""
ping @wuchong

[XBaith]

@XBaith thanks for addressing my comments, I only have one little comment about adding the ""
ping @wuchong

这个修改是根据官方要求的翻译规范的。
如果需要我可以修改一下

[wuchong]

LGTM.

Thanks for the contribution @XBaith and the reviewing @klion26 .