Calculation is worng with other locale than "en"

[HaraldWeber]

| A    | B    |
|------|------|
| 1    | 2    |
| 2    | 4    |
| 3.1  | 6,1  |
| 4    | 8    |
| SUM^ | SUM^ |

What happens
In column A the calculation is correct but 3.1 is in the wrong locale notation.
In column B 6,1 is in locale de-DE notation. The sum is calculated wrong.
The sum is always displayed in the correct locale.

What should happen
The locale setting should also apply to the operands of the SUM operation.

I'm using the following settings

[Wiredframe]

Yeah I would also love to not have to use period as decimal symbol. But nontheless I'm glad this extension exists. Numerals is great too, but this is far more lightweight. Thanks!

[RWTH-MK]

This also applies to the MUL operation, and I expect it to affect AVG/MIN/MAX as well