Although I have asked question about this, smthg is missing

Hello,
Although I have asked question about this, smthg is missing in my understanding.
Regarding the appointment + plugin,
where I want to enable french/english as a choice for the front end customers,
I am in possesion of a copy of the 60% completed appointments-fr_FR file, but where /which directory or subdirectory must it go into?

I do not wish to use WPML.

I have no other plugins related to language yet.

I am a newbie at this, but have means to copy and or paste code with specific instructions. (I use transmit).

This same condition(2 languages), I would like to apply to the membership plug-in.

Also, is there a direct link to access the tutorials vids without embedding them on my WP site?

Thank you for your great support,
you are all quite good.

I'll get up to speed eventually.

Robert