In Norway, it kinda depends... No one would dare approach you about your lawn directly, but they may certainly take offense at your lack of conformity, and will gossip heavily and indirectly behind your back. If a direct approach is deemed necessary, a representative may seek you out and make vague mentions of the weather and how it can affect grass growth. This is a fairly extreme tactic however, and will generally be avoided unless absolutely necessary.
Normally such things will be ignored however, unless you make a point of standing out. Keep your house painted in acceptably dull colors and refrain from exhibiting flashy art installations on your property, and you will be left alone.
While larger cities generally attract immigrants who have not yet learned to master the finer antisocial niceties expected in society, do not fret if your situation demands a more urban living situation... Most residents practice acceptable levels of avoidance, such as taking the stairs if someone else appears to be using the elevator, and timing the unlocking and opening of their door so as not to encounter anyone in the hall.
We have a neighbor in the apartment directly adjacent to ours, who has been living there for several years. I'm not entirely sure he exists.
Though the remoteness may be tempting, I would recommend against living in Svalbard. While the population density rivals even that of Alaska, the people living there are required to keep in better contact with one another due to the omnipresent dangers of snowstorms and bears. Alcohol is also somewhat cheaper (or at least moonshine is more readily available due to less policing), so people may be socially drunk on a more frequent basis, and can sometimes attempt conversation. The climate is also just about as bad as it gets.
As for language, while everyone learns English in school, not everyone retains any competency in it. Norwegian is reasonably close to English though as far as languages are concerned, and although not an easy language by any means, they share enough grammar and word structure that it's not too difficult to figure out.
However, there's a catch... There's Norwegian, and then there's Norwegian. There are actually two distinct official languages, and they're different enough from each other to cause confusion in both directions. Additionally, they both have dozens of local dialects ranging from the slightly exotic to the completely unintelligible. Due to the similarities, people also can get by with speaking Swedish or Danish as their primary languages, but to someone who didn't grow up in Scandinavia these oddballs are like starting all over again from scratch.
Finnish... fuck, dude. Lots of people in Finland (particularly certain areas) speak Swedish as well as Finnish. Just learn Swedish instead, at least to start with.
You know how Finland keeps getting its educational system ranked the highest in the world? Well, they're forced to. They need the best in order to teach their own kids the damn language.