Explain the problem as you see it
Currently the number field expects a decimal number with a decimal point but in lot of other countries the decimal portion is separated by a decimal comma. Tana should use the locale setting of the system to render the decimal number instead of a fixed use of a point.
Why is this a problem for you?
Germany and other countries) are using a comma as separator for the decimal portion. Insert 0,5 in a number field will be interpreted by Tana as 5. This leads to wrong calculations in formula cells.
Suggest a solution
Values in number fields should be rendered using locale settings of the users system.