Translation:You speak English and I speak Romanian.
"engleza" and "româna" are the articulated forms (with definite article) of the nouns "engleză" and "română".
"engleza" means 'the language' and "engleză" means 'language'.
When you say "limba engleză" or "limba română" the words "engleză" and "română" are used as adjectives.
româna = limba română
engleza = limba engleză
It is important to mention that the most used is the second form (limba română, limba maghiară, limba germană, etc.)
That's what I was wondering too and hope someone can clarify. Hence my question above. However if I may guess, remember how fată is 'girl' but fata is 'the girl'? I noticed they say engleza for 'English' but la limba engleză for 'the English language', so that could be the difference. Somewhat like English (adjective) and 'the English' (noun). I am sure I'm wrong somewhere in this deduction though lol.