zh-CN: Proofreading and update plan for the JavaScript statement

[JasonLamv-t]

I am going to proofread and add/update the translations about the JavaScript statement:

Statement

Beta Give feedback

1. [zh-cn]: update the translation of statement overview #18275
   l10n-zh +1
2. [zh-cn]: update the translation of async-function in statement section #18284
   l10n-zh +1
3. [zh-cn]: update the translation of async-function* in statement section #18301
   l10n-zh +1
4. [zh-CN]: update translation of block statement #18949
   l10n-zh +1
5. [zh-cn]: update translation of break property statement #18980
   l10n-zh +1
6. [zh-cn]: update the translation of class statement section #19004
   l10n-zh +1
7. [zh-cn]: update the translation of const in statement section #18798
   l10n-zh +1
8. [zh-cn]: update the translation of continue #19892
   l10n-zh +1
9. [zh-cn]: update translation of debugger statement #18945
   l10n-zh +1
10. [zh-cn]: update the translation of do-while #19891
    l10n-zh +1
11. [zh-cn]: update the translation of Empty statement #19019
    l10n-zh +1
12. [zh-cn]: update the translation of export #19893
    l10n-zh +1
13. [zh-cn]: update the translation of the expresstion statement #21288
    l10n-zh +1
14. [zh-cn]: update the translation of for in statement section #18407
    l10n-zh +1
15. [zh-cn]: update the translation of for-await...of... in statement section #18769
    l10n-zh +1
16. [zh-cn]: update the translation of for...in... in statement section #18644
    l10n-zh +1
17. [zh-cn]: update the translation of for...of... in statement section #18742
    l10n-zh +1
18. [zh-cn]: update the translation of function in statement section #18317
    l10n-zh +1
19. [zh-cn]: update the translation of function* in statement section #18328
    l10n-zh +1
20. [zh-cn]: update the translation of the if-else statement #21313
    l10n-zh +1
21. import, in progress
22. label
23. [zh-cn]: update the translation of let in statement section #18895
    l10n-zh +1
24. [zh-cn]: update the translation of return statement section #19321
    l10n-zh +1
25. [zh-cn]: update the translation of switch statement section #19316
    l10n-zh +1
26. [zh-cn]: update the translation of throw statement #19025
    l10n-zh +1
27. try...catch
28. [zh-cn]: update the translation of var in statement section #19151
    l10n-zh +1
29. [zh-cn]: update the translation of while in statement section #19392
    l10n-zh +1