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Q2A version: v1.5
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This was posted a while ago, but has some created a easy solution like NoahY mentioned in b)
or like it´s mention here:
http://www.question2answer.org/qa/27257/easy-way-to-replace-commas-by-dots

Best would be without core hacks.

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It's pretty hard-coded as it is now... the function being used is PHP's number_format(), which, taking only one argument, formats it wil a comma:

http://www.php.net/manual/en/function.number-format.php

So, either

a) go through the code changing this function,

b) create a custom layer with preg_replace() on things like  $this->content['ranking']['items'][]

c) ask nicely for the points format to be more flexible in a later release.

...