I found a direct translation online:
Do you have some time for me?
Then I'll sing a song for you
About 99 balloons
On their way to the horizon
Are you perhaps thinking of me?
Then I'll sing a song for you
About 99 balloons
And that something (like the war) comes from such a thing (the balloons)
99 balloons
On their way to the horizon
They thought they were UFOs from space
So a general sent
A flying squad out there
To raise the alarm if it was true
Yet there on the horizon were
Only 99 balloons
99 jet airplanes
Each one was a great warrior
Thought that they were Captain Kirk
There were great fireworks
The neighbors didn't understand anything
And felt immediately felt pissed off
Yet there they shot on the horizon
At 99 balloons
99 war ministers
Matches and petrol cans
Thought that they were clever people
Already caught wind of great spoils [of war]
Shouted: War, and wanted power
Man, who would have thought
That one day it would come to this
Because of 99 balloons
99 years of war
Don't leave a place for victors
There are no ministers of war any more
No jet planes either
Today I'm doing my rounds
Seeing the world lying in ruins
Found a balloon
Think of you and let it fly