I know this will never be perfect, Czech is a great example… it is actually very difficult language.
Another example… imagine the phrase X years
Simplest would be inserting the dynamic number and followed by the translation of “year”
More sophisticated solution would be checking the number and if it is just 1, then use singular, in other cases plural. This is more code, but should work. Well… not really… check this out:
In Czech:
1 rok
2 roky
5 roků or 5 let
…
and we have a problem… If you say “5 roky”, everyone will of course know what you mean, but it would probably sound to us something like “1 years”