Update formatted number string to int parsing to fix different locales

[whizz]

The helper function intcomma() uses toLocaleString(), but the reverse toInt() blindly assumes comma as a thousands separator and tries to remove just commas. In my locale, the thousand separator is space, so the functionality silently breaks. It parses "10 000" as 10. This fix addresses it by removing anything other than digits.

[medisoft]

it could be a problem in locales like some European countries.