contributing guide: update translation tasks claim process (#4721)
contributing guide: update translation tasks claim process (#4721)

* contributing guide: update translation tasks claim process

* refine format

* refine format

* add command table

* Apply suggestions from code review

Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Lilian Lee <c684465c17314189c18707959627e2ec4fdec2d0@pingcap.com>

Co-authored-by: yikeke <9eab6a9266c1a471ca02f5c04fa0a3b857620cf9@pingcap.com>
Co-authored-by: Keke Yi <4b13e11d5beb5669a80650bc9e0535372af5b679@users.noreply.github.com>
Co-authored-by: Lilian Lee <c684465c17314189c18707959627e2ec4fdec2d0@pingcap.com>
pingcap/docs-cn,pingcap/docs-cn