WHAT? No way!!!!
it doesn't accept "mója brytyjska przyjaciółka mowi po angielsku"
Added and made an ex aequo 'best answer'.
Really? But what is "mója"???
Since mója is not a word, Jellei most definitely added moja.
I wrote 'kolega' instead of 'przyjaciel' and it doesnt work, why?
We only recently decided to accept "kolega" (and also "znajomy") as a translation of "friend", it might not be added everywhere. Added here now.
Please remember that "przyjaciel" is a lot closer person than "kolega". But English would probably use "friend" anyway.
Does the following 'i' soften the 'g' in angielsku
Yes, it does.
"...is speaking English" would make more sense here. There should be no doubt about his/her ability.