fix: Italicize the "et al." generated by the \citet command

[fang-d]

Italicize the "et al." generated by the \citet command by replacing the "et~al." in the bst file with the \etal marco defined in cvpr.sty.

Thanks for considering my pull request.

CC: @cr333, @taiya.

[cr333]

Most major style guides, including IEEE, APA, MLA, the Chicago Manual of Style, and Harvard, do not require italicizing “et al.”, see APA Style, CHicago Manual of Style via StackOverflow, NCBI Style Guide.

So “et al.” is not italic on purpose and I am strongly in favour of keeping it that way.

Nevertheless, you are free to make this change in your papers if you prefer it that way.

[fang-d]

Thanks for your reply. I will close my pull request.