Introduction callbacks

[nildo]

[CLAassistant]

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2 out of 3 committers have signed the CLA.

:white_check_mark: nildo
:white_check_mark: odsantos
:x: Nildo Júnior

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[odsantos]

Hi @nildo could you please resolve the conflicts? Thank you.

[javascript-translate-bot]

Please make the requested changes. After it, add a comment "/done".
Then I'll ask for a new review :ghost:

[nildo]

/done

[javascript-translate-bot]

Please make the requested changes. After it, add a comment "/done".
Then I'll ask for a new review :ghost:

[odsantos]

Hi @nildo , the English article was updated and this PR has conflicts. Thanks.