[devoply]

It makes no sense to put it in 1 language. put any sort of signage in at least 5-10 languages. and also use a linguist to determine the right set of words to warn of danger. that text is extremely ambiguous. also pictographs are probably much more universal than anything to do with words.

[tempay]

Even then it isn't simple to make pictures: a) last thousands of years b) unambiguous too all possible cultures that might encounter them.

There is a particularly good episode of 99% invisible (podcast) that talks about some of the challenges involved.[1]

[1] http://99percentinvisible.org/episode/ten-thousand-years/

[tiku]

A glowing rosetta stone..