It was very interesting, I reached to Woody ;-), I think this was the last page where you get the old lady dancing, it took a while searching for numbers in many languages, here are my answers, :P.

1- 1.
2- 2.
3- Three.
4- iv.
5- evif.
6- ssiixx.
7- 7777777.
8- Neptune (Solar system).
9- Neun (German numbers).
10- Oct (Months).
11- Jack (playing cards).
12- tWeLvE (Case sensitive letters).
13- 169 (13*13).
14- number14 (try to highlight).
15- quince (Spanish numbers).
16- Lincoln (The 16th president for the US).
17- septendecim (Latin Numbers).
18- 10010 (Binary System).
19- Potassium (The 19th n the Periodec Table, Chemistry).
20- uxfouz (+1 Letter in the alphapet).
21- icosihenagon (21 side object).
22- 17711 (The next Fibonacci number).
23- Woody (22 simpl Vooey, 23 is Woody).

Then you will get your prize, and old woman dancing for you :))

Cheers.