I assume that he is not referring to the decimal separator, but to the separator between thousands, e.g. that this 1000000,00 becomes this 1.000.000,00, or the anglophone way to write it: 1000000.00 becomes 1,000,000.00.
Makes reading and entering long numbers easier.
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I think it can be in question template, not in core
Assistance on LimeSurvey forum and LimeSurvey core development are on my free time.
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