convert comma decimal separator to dot before handling the coordinate

[johnnycocas]

The import coords file function does not handle the values properly if the separator is a comma instead of a dot, this should fix that issue.

[johnnycocas]

Accidentally closed thinking I was doing this on the fork.

Please review the code before merging.

[johnnycocas]

Yeah, it shouldn't happen much as I assume the majority of users is from a locale using dots for decimals, but you never know ;)