The IB comparison article is good, but 4 years old. Unis are mostly much better at making more equivalent offers. DC1 needs 34 points, with 6 5 5 at Higher. That's like needing ABB. (max grade is 7, in each of 6 subjects, plus max 3 points from Core: CAS, ToK & EE)
IB is still unusual in the UK, especially in state schools. We're very lucky in Cambridge to have two state sixth forms who offer it, as well as one of the private schools. Unis got more familiar with it as they took in more international students to get the fees!
There are two languages needed, but one is your native tongue.
So DC1 has done English, a science & a humanity at Higher level, with maths, a 2nd language & another humanity at Standard level.
The really cool bit about the 2nd lanfuages is that not only can you continue an existing language from GCSE to either Higher or Standard, but there are also some languages offered as ab initio i.e. from beginner, to Standard level.