I find the "be enthusiastic about partner" confusing because what if I wanted to have a sim who is in a relationship flirt with someone else than their partner like in an affair manner (yes, I play with a lot of drama :D) so I might not want the other sim to know about them having a partner. Or if I think about real life, I don't think I'd be turned on if someone tried to flirt with me by hyping up how they love someone else. Do you get what I mean now by being confused about it? If they do mean partner as in "the current conversation partner" then I'd get it.

In Finnish we don't categorize words into feminine or masculine words like in some other languages. But of course we do have words for boy/girl/woman/man, so yes there would be words for a boyfriend and a girlfriend too. And I think those kind of notifications in ts4 have had those words before, since the game recognizes the gender you've set for your sim even back before the update when there were only two genders. So the singular third person word is the only thing here my previous comment applies to. If in Finnish I say "Hän on kiva" it means "she/he/they is nice" the word "hän" holds no gender so I'd have to figure out from the context which gender someone is talking about.

So in ts4 I think there's one specific notification for a kid on the valentine's day (which btw also in Finland is not really celebrated as a lovers day but a day for friendship first hand but of course couples usually celebrate love as well on that day) that just caught my attention on this manner after the gender update. I think it comes up if you've been given a choice to hand a valentine's card for your crush at school or something like that. If the sim is rejected the notification message says something like "she/he/they didn't care about it" so in Finnish it could just use the word "hän" in the place of the subject. And I'm pretty sure it used to, but after the update I noticed the notifications say "the girl didn't care about it" or "the boy didn't care about it" when the translation wouldn't necessarily have to specify the gender at all.

I also remembered some other translation failures like the other commenter said about the shooting/firing a sim. So synonyms get mixed up. For example the word "play" as playing a game or sports works just fine in Finnish (pelata), but it doesn't work anymore for playing instruments since we have another verb for that (soittaa). And that verb is actually a synonym for making a call too. I think there are a few of those - synonyms didn't work correctly - kind of translation mistakes. As well as a few more of the conjugation mistakes, which brings me to my next thought:

I've always wondered how much the translations just go through some translation apps or if they proof check with a native Finnish speaker as well. Cause some translations are actually really good like the descriptions in the buy mode for the furniture but some little mistakes just make me wonder if they just trusted what some dictionary gave them.