This message states "The value you specified is not a number.".
In languages that use a decimal comma, not a decimal point, "0,1" is a number. Yet, this is not considered by the software. For example, in the VIPS Test page of the portuguese wikipedia, a sharpness value of "0,8" yields the error message.
Is this a software issue on some pages (the software supposedly handles localisation of number formats) or can we just diverge locally and adapt the message for our language to suggest that the user tries the non-standard decimal point?