Ola in Portugues is a lot like Hola in Spanish.>^_^<

Well.... I'm pretty sure all of them have been said but here's all I know:

English: Hello
Ghetto American: Yo, wut up, dawg!
German: Guten Tag, Hallo. (either one. The first one actually means good day when directly translated, but same deal)
Japanese: -romaji: Konnichiwa, konbanwa (good day or hello, good evening)
-Kanji: こんにちは, こんばんは
French: Bonjour
Vietnamese: Xin chào
Thai: สวัสดี
Spanish: Hola
Hawaiian: Aloha
Italian: Ciao
Korean: 안녕하세요

Yeah so... thats it

OLÁ - portuguese

hihi

In Dutch

Hallo (The A sounds like the Japanese A (Don't know how to explain)

Hoi

informal Korean: An-nung
Formal Korean: An-nung-ha-se-yo?
:)

Swedish: hej

Dutch: Hallo or Hoi or Hey ( it varies to where you are and the dialect of the place)
French: Bonjour
german: Hallo

Maori: Kia ora
Cook island: Kia orana

:D

I know more than all of you. :(

Albanian:
përshëndetje

Arabic:
مرحبا

Bulgarian:
привет

Catalan:
hola

Chinese (simplified):
喂

Chinese (traditional):
餵

Croatian:
zdravo

Czech:
ahoj

Danish:
hej

Dutch:
hallo

Estonian:
tere

Finnish:
hei

Galician:
Ola

Greek:
γεια σου

Hebrew:
שלום

Hindi:
हैलो

Hungarian:
helló

Latvian:
sveiki

Lithunian:
labas

Ukrainian:
привет

I got bored. TT__TT
Google Translate= LOVE.

Oh yeah, forgot another one:

Samoan - Talofa