There is a need for the World War 2 setting. If I straightaway listed those 3 words, the answer would be too easy. But with the Europe setting, the question of which language it is would be the main idea in the solvers' mind.
And it is not irrelevant or unlikely, as wooden signposts were common then.
Also, one strategy of puzzles is diversion. So even if it is irrelevant or unlikely, the question would not necessarily be unpuzzleworthy.