So beautiful

• 1. Lit. "This won't remain here". The phrase "Tämä ei jää tähän" is something that you can say when you end up in an argument or a fight, you're not contempt with the conclusion and want to tell the other party that this will be resumed at a later time. It thus implies strong displeasure with the current state of things.
• 2. I wasn't able to find a good English equivalent for the word "teutaroida". It's an urban word that can be used when a dog for example is going here and there in panic/anger/joy, pulling the leash and trying to break free. The word "oikein" implies that this action is done seriously or with great effort. The word "se" is the non-human 3rd person "it", but using it when referring to a person is rather common in casual Finnish.
• 3. This sentence is intentionally lacking parts, but it doesn't sound as good in English as it does in Finnish
• 4. There might be a mistake in the Finnish lyrics, but it's hard to say. "ei epäröi nyt kumpikaan" means "neither [of us] hesitates now" whereas "ei epäröinyt kumpikaan" means "neither [of us] hesitated". Both kind of make sense and in a song the pronunciation can be exactly the same as well, but it seems to me that the latter is the correct one.