UN official language means that UN will use those languages. Every papers of any matter including UN resolution are translated in every UN official languages. This is a huge task indeed and of course an expensive process. Many skilled translators are needed for this process. This is done with UN fund.
Many experts fear that even if Bangla is accepted as an UN official language, UN may ask Bangladesh to fund for that process. Being a poverty stricken nation it will be a burden for the Bangladeshis.
But it is an emotional issue for the nation. A signature collection campaign demanding Bangla as an UN official language is started. The campaigners are hoping to collect five crore signatures. They have already collected one crore signatures.
Prime minister Sheikh Hasina herself also urged nonresident Bangladeshis to mobilize global opinion.