Struggle and Social Justice in the Name of a People's Language

There are limits to nationalism, and thus there are limits to that illusory idea of a national language. The key question here is this: what is that 'nation' that is invoked here? And whose 'nation' is this nation? When a nation-state is made up of many 'nations' and not one, how does this 'nation' in the 'national language' play out?