Open tabs in background with middle click is standard. If you can't do that anymore, you have broken something in your profile. Try and reset it by going to preferences > Advanced > Shortcuts, and use the default Mouse setup

I highly recommend this extension for laptop users tho Open in background tab with longpress If you click a link for a short while, it's opened in a background tab. Ideal for laptops without middle click.

There are tons of other great extensions there too, like no ads etc. If they give you a warning about setting the userJS storage quoata, just copy the address opera:config something in the alert, paste it into the addressbar, and set the value to 500 and click save. Ads will now be blocked.

Why would you want to open a new tab with back and forward? Back and forward are for going back and forward in history.... Use the plus button to make a new tab or press Ctrl T

Something like that. The area around Oslo is where you find people that talk closest to bokmål. And in the western parts of Norway you find people that talk the closest to nynorsk. The point is that in school you learn both. There might be some words in nynorsk that not everyone know what is, but it's not a problem, they are very similar. Nobody talks exactly like the written language. There are too many silent letters that are never pronounced etc.

Nynorsk is a complete waste anyway, I don't see why a country with 4.7 million people needs two almost identical languages.