It's the informal version of 'you', so it is second-person singular. You can use 'thou' to force Google translate to translate from English to the informal for

It's the informal version of 'you', so it is second-person singular. You can use 'thou' to force Google translate to translate from English to the informal form of another language. Otherwise, it will give you the formal translation. This is safer if you don't know the social/cultural implications of using the informal form (it can be insulting or inappropriate in some contexts), but it's not always what you want.