"Les" here is an indirect object and it translated to 'them' in English, or 'you'. But in Spain, the sentence is the same. Spain uses the formal 'ustedes' just like Latin American. 'Vosotras is the plural 'tú' and used in Spain when speaking informally, so in an informal situation your sentence would be correct.
Going "ARG" as I flip my fingers up and down on my lips and making burby sound at this translation which by the way I got wrong !!
ok, from a non native English speaker here: does this sentence then refer to giving someone credit for what they did (in a non monetary sense - as in "I credit it to him that he spoke up for my younger sibling") or is credit here still referring to money (as in a loan)? Please and thank you :-)