Research has found STEM and non STEM grads have equivalent career outcomes in the UK. So if you prefer doing languages and continuing with them to degree level, do that!
Universities don't care about what combination of A-levels you're taking provided you're taking any required A-level subjects for the degree you're applying to.
That said i would recommend doing 4 A-levels unless two are maths and FM - if your school requires it to start with just plan to drop one in year 12. You don't get "bonus points" for doing additional A-levels.