Divider
 

How can I change which way PhotoPost writes the number of posts for each user? Today it's like this: 1,354. But the correct way in my country is: 1.354

So, not a ',' but a '.' :)

That is not a configurable thing. You would need to change code in almost every file where ever you want to change the number format

PHP: number_format - Manual

Not too sure where you mean user posts numbers there are several spots I know of

Well since it's already an option in vBulletin, I find it kinda strange that PhotoPost doesn't use the same "system".

When a users post count are showed in vB, it's correct. When he posts a picture in Photopost, he suddenly appears with the incorrect divider.

We are not vbulletin and we simply use the php number_format command for numbers. There is no php switch to determine different formats