[zh-cn]: add & sync transaltion for File API

[skyclouds2001]

File API

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1. File API
2. Using files from web applications
3. Blob and Blob()
4. Blob.size and Blob.type and Blob.slice()
5. Blob.arrayBuffer() and Blob.stream() and Blob.text()
6. [zh-cn]: sync translation for File and File() #20433
   l10n-zh +1
7. [zh-cn]: sync translation for File.{lastModified,lastModifiedDate,name} #20418
   l10n-zh +1
8. [zh-cn]: sync translation for FileList #20356
   l10n-zh +1
9. [zh-cn]: add translation for FileList.length #20358
   l10n-zh +1
10. [zh-cn]: add translation for FileList.item() #20357
    l10n-zh +1
11. [zh-cn]: sync translation for FileReader and FileReader() #20324
    l10n-zh +1
12. [zh-cn]: sync translation for FileReader.{error,readState,result} #20335
    l10n-zh +1
13. [zh-cn]: sync translation for FileReader.{abort(), abort, load} #20359
    l10n-zh +1
14. [zh-cn]: sync translation for FileReader.{readAsArrayBuffer(),readAsBinaryString(),readAsDataURL(),readAsText()} #20325
    l10n-zh +1
15. [zh-cn]: add translation for FileReader.{error,loadend,loadstart,progress} #20392
    l10n-zh +1
16. [zh-cn]: sync translation for FileReaderSync #20170
    l10n-zh +1
17. [zh-cn]: add translation for FileReaderSync() #20270
    l10n-zh +1
18. [zh-cn]: add translation for FileReaderSync.readAsArrayBuffer() #20272
    l10n-zh +1
19. [zh-cn]: add translation for FileReaderSync.readAsBinaryString() #20271
    l10n-zh +1
20. [zh-cn]: add translation for FileReaderSync.readAsDataURL() #20273
    l10n-zh +1
21. [zh-cn]: add translation for FileReaderSync.readAsText() #20274
    l10n-zh +1
22. [zh-cn]: update the translation of URL createObjectURL() static method #20673
    l10n-zh +1
23. [zh-cn]: update the translation of URL revokeObjectURL() static method #20676
    l10n-zh +1