English 2nd person plural verb form...
If it weren't for the colloquial nature of the expression, I think a "y'all" included in the translations would be helpful...we could pretend it's the Southern German dialect. :P
"Ya'll" (note the correct spelling) and "All Ya'll" should become standard English since they fill a deep vacant spot in the language. So many regional English styles correct The Queens.
http://www.merriam-webster.com/dictionary/y'all The spelling was correct the way I did it, because the commas in a contraction replace the missing letters; in the case of this contraction, the comma replaces the missing o and u in "you all." And I don't really believe there's such a thing as "standard English" anyway, no matter what organizations exist. Language exists as a means to communicate ideas, not as a religious body for grammar worshipers. The important thing is that ideas are communicated clearly and efficiently.