Swedish has wrong flag

I have changed the name of swedish flag and created the patch.

Yep having flags included is really cool, but unfortunately flags are represented with country codes (well... that makes sense !), and languages are represented with language codes. And that's very different.
So here are a few that need renaming:

Czech Republic : cz -> cs
Denmark : dk -> da
Greece : gr -> el
Japan : jp -> ja
Korea : kp -> ko
Portugal : pt -> pt-pt
Brazil : br -> pt-br
Ukraine : ue -> uk
Norwegian : no -> nb and nn
China : zh-hans and zh-hant

Arabic for example is spoken in many countries. There are a few attempts at a language flag, nothing too official, but it gets the job done.

There must be quite a few others.