You can change these settings at the language settings. They are found after activating developer mode, going to settings->translations->languages->your language. It will say thousand separator and decimal separator. 

Hope that helps.

Hi Paulo Manuel,

Please go to the Settings --> languages and select your active language and add the Separator Format : [2, 3, -1]

The Separator Format should be like [,n] where 0 < n :starting from Unit digit. -1 will end the separation. e.g. [3,2,-1] will represent 106500 to be 1,06,500;[1,2,-1] will represent it to be 106,50,0;[3] will represent it as 106,500. Provided as the thousand separator in each case.

Hope it will help you.