The UN officially has 6 official languages: English, French, Russian, Arabic, Spanish and Chinese. The reason, supposedly for this is that these are the languages spoken by the largest groups of people of the member, or initial member states, and the world in general.
However, it only seems appropriate to add Hebrew as an official language, as that is the language spoken by the group of people who have the largest number of UN resolutions directed at them.
Remember, it is Hebrew-speaking Israel, not Farsi-speaking Iran, or Urdu-speaking Pakistan which has been singled out for a full third of UN human-rights commission hostility. It is Hebrew-speaking Israel who has the honor of provoking the only joint session of the signatories of the Geneva Conventions.
Perhaps if the UN made Hebrew an official language they could get Israel to take them seriously.