[MC-121743] Feedback of some commands uses OS locale for formatting decimal numbers

The feedback of some commands uses the OS' locale for formatting decimal numbers.

List might be incomplete, last updated for 17w45b

Command	Argument(s)	Notes
data	scale	-
spreadplayers	distance	Affects success error message like the ones from MC-97196

Change your OS locale to for example German
Use the following command
```
/spreadplayers ~ ~ 0 1 false @s
```
→ A comma is used as decimal separator for the distance

Linked issues

/data get <Some selection> <Some path> 1.0 gives 1,00 as well. Probably universal.

Did you mean /data?

Yes, of course, my bad.