at: update French and Chinese translation

[sebastiaanspeck]

Ref: #14220

• The page(s) are in the correct platform directories: common, linux, osx, windows, sunos, android, etc.
• The page(s) have at most 8 examples.
• The page description(s) have links to documentation or a homepage.
• The page(s) follow the content guidelines.
• The page(s) follow the style guide.
• The PR title conforms to the recommended templates.

[sebastiaanspeck]

Feel free to update the /common/at.md in this PR, which is outdated in French and Chinese.

[LiLittleCat]

BTW, @sebastiaanspeck @blueskyson, do we need to strictly keep stdin in English instead of translating it to 标准输入? The style guide suggests avoiding translations for certain technical terms:

tldr/contributing-guides/style-guide.zh.md

Lines 244 to 249 in 1606ebd

	在命令描述中，如果出现了技术性的专有名词，请用 `反引号` 括起来：
	- 路径，例如 `package.json`，`/etc/package.json`。
	- 扩展名，例如 `.dll`。
	- 命令，例如 `ls`。
	- 标准流：`stdout`，`stdin`，`stderr`。**不要**使用完整的名称（例如标准输出）。

I noticed some existing translations don’t fully follow this guideline. If we decide to enforce this strictly, I can review and adjust any inconsistent translations.

[sebastiaanspeck]

BTW, @sebastiaanspeck @blueskyson, do we need to strictly keep stdin in English instead of translating it to 标准输入? The style guide suggests avoiding translations for certain technical terms:

tldr/contributing-guides/style-guide.zh.md

Lines 244 to 249 in 1606ebd

	在命令描述中，如果出现了技术性的专有名词，请用 `反引号` 括起来：
	- 路径，例如 `package.json`，`/etc/package.json`。
	- 扩展名，例如 `.dll`。
	- 命令，例如 `ls`。
	- 标准流：`stdout`，`stdin`，`stderr`。**不要**使用完整的名称（例如标准输出）。

I noticed some existing translations don’t fully follow this guideline. If we decide to enforce this strictly, I can review and adjust any inconsistent translations.

If it is in the guideline, we should follow it. If you find translations who do not follow, feel free to open a PR.

[nicokosi]

I "soft-approve": French version is OK for me but I can't approve the Chinese part. 😇

Outdated

[sebastiaanspeck]

@Nico385412 @nicokosi @noraj could you please look at this PR? We are waiting for your review.

[noraj]

LGTM now for the French part