Hi Sorin - thank you for this "europe-positive" Post ;-) Being at Steem.Camp2018 i am totally with you: we all did not know us in real life befrore and we had a great time together!!!
The language is very important, my english is not very good and i have not participate in the english "steem(it) diskussions. (What did not matter much)
There was another member not native german speaking (pharesims spanish friend) and she had difficulties to talk with us because she is just learning english... So, the language is important and it is good to learn English (i don't know another language that is so universal - maybe that will change in future?) to have more fun. It is so amazing that your daughters can speak many languages right now! That opens many doors - not only in Europe.
Greetings Kadna