Is it correct to parametrize language independent strings like final or a function name? I figured that PHP is always written in English?

This is more correct -- we can degrade this to the inlined version (by recognizing that the parameters are constants) but can not do the reverse. It might not matter (depending on whether programmers who happen to be bilingual users do the translations or if we pay professional translators who might not have programming experience) and I'd also accept the less-correct-but-still-probably-correct-enough version with final/abstract in the strings, but this is strictly better.