fix(dashboard): add sub-command count label

[he-yufeng]

Summary

• add the missing detail.subCommandsCount translation used by the plugin detail command-group row
• keep zh-CN, en-US, and ru-RU locale files in sync so the dashboard no longer renders [MISSING: features.extension.detail.subCommandsCount]

Fixes #8378

To verify

• node -e JSON.parse(fs.readFileSync(...)) over the three extension locale files
• npm run typecheck
• git diff --check

Summary by Sourcery

Add the missing sub-commands count translation to the dashboard extension detail view and synchronize the affected locale files.

Bug Fixes:

• Restore the missing features.extension.detail.subCommandsCount label so the dashboard no longer renders a missing-translation placeholder.

Enhancements:

• Align en-US, zh-CN, and ru-RU extension locale files to keep translation keys consistent across languages.

[sourcery-ai]

Hey - I've left some high level feedback:

• Since this key now needs to stay in sync across multiple locale files, consider introducing a shared base locale or a generation script to reduce the risk of future divergence between en-US, zh-CN, and ru-RU.
• For detail.subCommandsCount, verify whether any of the supported languages require locale-specific pluralization rules, and if so, consider using your i18n library's pluralization features instead of a single static label.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Since this key now needs to stay in sync across multiple locale files, consider introducing a shared base locale or a generation script to reduce the risk of future divergence between en-US, zh-CN, and ru-RU.
- For `detail.subCommandsCount`, verify whether any of the supported languages require locale-specific pluralization rules, and if so, consider using your i18n library's pluralization features instead of a single static label.

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[gemini-code-assist]

Code Review

This pull request adds a new localization key subCommandsCount to the English, Russian, and Chinese translation files. The reviewer pointed out that the translation strings for English and Russian do not handle pluralization correctly, which will lead to grammatically incorrect outputs for certain counts, and provided suggestions to use the proper i18n pluralization syntax.

[gemini-code-assist]

The translation string "{count} sub-commands" does not handle pluralization. If there is only 1 sub-command, it will display as "1 sub-commands", which is grammatically incorrect. Consider using the pluralization syntax supported by the i18n library (such as vue-i18n's pipe | syntax).

Suggested change

	"subCommandsCount": "{count} sub-commands",
	"subCommandsCount": "{count} sub-command | {count} sub-commands",

[gemini-code-assist]

The translation string "{count} подкоманд" does not handle Russian pluralization rules. In Russian, nouns have different plural forms depending on the number (e.g., "1 подкоманда", "2 подкоманды", "5 подкоманд"). Using a single static string will result in grammatically incorrect phrases like "1 подкоманд" or "2 подкоманд". Consider using the pluralization syntax supported by the i18n library.

Suggested change

	"subCommandsCount": "{count} подкоманд",
	"subCommandsCount": "{count} подкоманда | {count} подкоманды | {count} подкоманд",