It would be very nice if "y'all," "you all," or something equivalent could be a correct translation of plural "you." I know it is a US regionalism, but in this region where I teach foreign languages, "y'all" is a very useful construction for helping my students understand the Spanish, French, or Latin 2nd person plural.
Well "you all" is just a little bit ambiguous. It can mean simply "you plural" (ye), or "all of y'all" (every last one of ye). The second meaning just gives more emphasis to the ALL. In Irish you can say "tá sibh" (y'all/ye are), and "tá sibh go léir" with "go léir" emphasising the ALL.
in any event, back when that was used "thou" was intimate "you" singular, "you" was formal "you" singular afaik. I am not aware of any formal second person plural in English, early modern or contemporary, just regionalisms as discussed above e.g. ye, yous, yiz, y'all, you guys. DL usually accepts the American "y'all"
Just to know something : I started with Irish not even one hour ago. I see that for the verbs TO BE and TO HAVE, the pronouns are different for each verb : i.e. TA for TO BE and IS for TO HAVE, but they remain the same for all persons ( I-You he-she etc.). What about all the other Irish verbs ? do the pronouns change with each one ? and do they always remain the same for all persons ? This would make things easier, of course.
I use the word y'all to mean "every single one of you." Like, if I'm addressing a group of friends (and I'm feeling like lazy speech, because in reality "y'all" really grates on me), it'd be "are y'all coming?" Not just a couple of them, but the whole group. Likewise, if I was on a stage in front of thousands of people in a rally and I cried out "Are y'all with me?!" it wouldn't mean "are more than one of you with me," it would literally mean "are every single one of you with me?".
It’s a massive flaw that they don’t elaborate which “you” to use when asking for you to translate it. It could be singular (tú), or plural (sibh), but since it doesn’t specify I end up losing a point if I don’t guess which one they expect from me. It’s very frustrating and it can ruin a streak or even take the last of your hearts on the middle a lesson.