Those plural forms are sometimes referred to as European continental dialect of English and do not raise questions here. If we, Europeans have to use English as lingua franca, we can and we will adapt it to our needs same way as Americans, Afro-Americans or Indians did. So my advice: just get used to it.

Edit: cultural possession of language is nonsense, it belongs to all speakers, native and non-native alike. Germans must get used to foreign influence on their language too and Ukrainians should stop fighting Russian language and start writing their own rules for it (what can piss Moscow more?)