Whats the problem? I've worked in Brussels and understand Flemish pretty well. The distinction between "first minister" and "prime minister" doesn't really translate that well into Dutch, because its based on a concept rather than a clear difference in terminology.
It is FAR more than just terminology, try explaining to average Dutch people, that I am not English and they are wrong to call me English. That the only correct way to refer to me is Scottish or British. Most don't get it. At all. And I am referring to Dutch here, but I could just as easily say a few other Euro nationalities too, including Belgians.
I wish I could buy "it's just terminology they don't get", but it's not. Those few who think that think Scotland is a country in it's own right, automatically think Alex S is our PM. They don't just think Alex S is the PM of Scotland, they think he has the powers that go along with PM too. They think David C is a non-entity and plays no relevance in day to day life in Scotland.
The rest think Scotland is just a part of England. In much the same way Manchester or NE England is a part of England.
I don't think its a problem of the citizens of another country struggling to understand why another country has a country within that which has both a Prime Minister and a First Minister, two governments and two sets of parliamentary members of parliament much less still claims to be unrepresented by democracy.
I am actually told repeatedly, lol, by Dutch people, that I can't have it both ways, I am either
a) Scottish, in which case Alex S is my PM
or
b) English, in which case David C is my PM.
very few people realise that the actual reality is
I am
c) British or Scottish and David C is my PM.
They don't understand the prime minister/first minister nuances, because they don't understand the very basics of the union of Great Britain.
This confusion has been around for decades here, but it's only increased as reporting of the referendum has increased.
They think me saying "I am Scottish, not English" is the exact same as someone from Leeuwarden in Friesland saying "I am Fries/Frisian not Dutch". Fries/Frisian people are Dutch. I am not English. I am British or Scottish. They don't get that. Because they don't get the union.