Google Translator uses for japanese learning:
- use manual writing to practise writing kanji mostly. Even when you can copy/paste, it’s good to write it down (if you’re too lazy to grab a pen and paper, you can do it there at least)
- check the rōmaji underneath only for the purpose of knowing the pronunciation of a kanji in that situation/word
- occasionally hear the audio (if there isn’t a better one around)
- might be ok for really short sentences (no more than 5 words) to get a general understanding of what’s written there. But even with short sentences isn’t that great.
Do not use it for translating texts or what you want to write in japanese.