Decimal validation error for french users

Hi,
I have one DECIMAL field in an English language based form. With English user it works, but for French users it doesn't validate the field saying it isn't a decimal since they use "," instead of "." for decimal field. I have put the condition for all read only fields and it is working fine only problem is with editable fields since the value is saved in a variable.How can I solve this issue?
 
 
Thanks.

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