My son was accepted to engineering with 4 years english, 5 math (including 8th grade), 4 FL, 4 lab science, 3.5 social science, 1.5 elective, 7 years VAPA (in his case, music). He has done well in UC admissions this year also.
If you look at the old MCA numbers, the bonus for the 5th year of English was relatively small, compared to the bonus for the 5th year of math. The bonus for the 4th year of FL was even smaller than for English. However, personally I would prioritize 4 years FL over 5 years English (if you have to choose between the two of them), since 4 years FL seems to be desirable at many other schools.
This is an explanation of the old MCA system (but remember that the system has changed since then, because of no standardized tests, so we do not know the weightings now): Understanding the MCA plus Calculator