what class can wield a 2h sword ?

[Ferth]

None and no.

[GerMagic]

None and no.

To elaborate a bit on this:

Currently there are actually no 2h swords at all. Also no 2h Maces or Hammers or something along those lines.

Marauder / Warrior wears a 2h Axe and is a tanking class. Note that you can't queue as a "DPS" (whyever dps is a word now, it's damage per second, how can that be a word for a damage-dealer?^^) when you're Marauder or Paladin (Warrior/Gladiator obviously too) even when you'd want to.

If you absolutely want you could go as a Warrior DPS. It is playable in lower-content (your burst is actually above average imho, though sustained DPS is lower than a "real" dd) if you find a static group that would take you. It doesn't even work for 4 mans otherwise though so not really recommended.

Also it's highly recommended to go Paladin, as a Gladiator sadly has no real upside to a PLD.