Swedish:
"Boten Anna" by Basshunter
"DotA" by Basshunter
(this one might be in Russian, but I'm not sure)
"Russian Privjet" by Basshunter
Hungarian: (part of it is in Hungarian at least, it's really pretty~)
"What About My Dreams" by ? (It was the Hungarian Euro-vision entry one year...that's all I know. I got it from 4shared. xD)
Japanese: (my ultimate favorites, because I love a /lot/ of Japanese music)
"Pub & Go!" by England
"Diver" and "Hologram" by Nico Touches the Walls
"Alice of Human Sacrafice" by The Vocaloids (multiple ones)
and of course "World is Mine" by Miku Hatsune
(sorry if I repeated any on your list, I couldn't go back and check once I started to type in all of these and I couldn't remember all of what you wrote down.)