"The cats eat fish."
Translation:I gatti mangiano il pesce.
Italian uses articles in the reverse way that English does. We use the definite article for a specific reference and omit it for the general case. Italian uses the definite article for the general case and omits it for a specific reference. That means that more often than not, if you use the article in English, leave it out of the Italian translation, etc.
The word "romance" only refers to love because romance stories used to be written in Romance languages. The word initially referred to the language and later developed a secondary meaning.
"Roman languages" would refer to the languages spoken in Rome, which also has two meanings - the Roman Empire and the present-day city of Rome. BTW, French, Spanish, Italian etc. were not spoken in the Roman Empire.
If it were just one fish (no matter the size) then the English here would be incorrect - that would be "the cats eat a fish" or "the cats are eating a fish".
But fish without an article in English would suggest that the cats eat fish in general - fish is their diet. It unlikely that the cats eat one fish their whole lives.
An infinitive is the unconjugated/dictionary form of a verb, like "mangiare" -- "to eat".
"il" is one of the definite articles ("the" -- indefinite articles are "un/una", like "a/an").
Italian uses the definite article before the noun because that's just how Italian grammar works. Different language, different grammar rules.
I addressed this problem on my newer model Samsung by adding Italian to my keyboard. Maybe this will work for you too.
Go into SETTINGS.
Choose GENERAL MANAGEMENT.
Choose LANGUAGE INPUT.
Choose LANGUAGE. Choose ADD LANGUAGE. Scroll down to ITALIAN (or any other language you want to add to your keyboard).
Your phone will now allow you type in Italian. SWIPE YOUR SPACEBAR TO THE LEFT and your keyboard will change to Italian. You can now type Italian words with Italian accent marks.
To change back to English, just swipe the spacebar to the right.
How was the question presented to you? If it was a dictation question, then it'll ding you for not transcribing exactly what it said. If it wanted to you type in your answer, are you sure you didn't make any typos or other errors? Both "i gatti mangiano il pesce" and "le gatte mangiano il pesce" are equally correct in the absence of any context to tell us whether all the cats are female or not. If it was a multiple choice question, please pay attention to the instructions at the top. It says to select all of the correct options. If you don't do this, it will ding you for failing to recognize a correct answer.
If you're positive you did nothing wrong, well, the app does glitch sometimes.