Earlier quoted context omitted.
The Economist uses diacritics in French, German, Italian, Portuguese and Spanish words, but deletes the diacritics from other languages (or maybe they keep them when they happen to resemble diacritics from those languages). I think I once saw a letter from a Hungarian complaining about that: a word they'd used meant something silly or obscene after they'd removed the diacritic.
Most publications are haphazard like this. The diacritic example also applies to Vietnamese, despite the alphabet coming from Portuguese. Similarly, Chinese and Korean names are usually written in the order they are pronounced, while Japanese names are reversed.
As a Chinese speaker this is maddeningly confusing when reading Western media. It's also a fairly new trend, I want to say a decade ago Chinese and Korean names were also read in Western order.