Albanian/Serbian--a ? of languages.

Why, I wonder, if one was either a Serb *or* an Albanian in Kosovo, would one not take steps to learn both languages?

I ask this question because it leads me to another. What language should *I* (and you) be learning, outside our first? And what excuses shall we (or do we) offer for not learning it?

(Please note: The previous paragraph was a blatant attempt to put an oughty-should on you. Consider yourself warned.)

Here's another related question. Jesus said "Blessed are the peacemakers, for they shall be called the children of God (one presumed this trumps "the children of Serbia, or Albania, or the U.S., or the U.K., or _________"). What other practical ideas do you have for being/becoming a peacemaker?