Where this really sucks is in programming when you write things like “The {{objectType}}” in your translations file.
Your program will replace objectType with the actual thing, so “The Ball”. All good, right? But then every other language has the weird conjugation, so “El Bola” doesn’t make sense anymore…
Some languages also consider different numbers in different way. I have one ball, two balls, and zero balls. Zero might not be plural like in English. Also, some language have a dual distinction that changes thing when there are two of something (not just singular and plural, but singular, dual, and plural).