Support salaries with spaces

[rtrv]

Describe the bug

When there's a string with a space, i.e. 120 000, it turns into 120 value.

How to reproduce

Create/edit a vacancy and put 120 000 into a salary field.

Expected behavior

I expect either 120000 as a numerical value from the string 120 000 or an error that the string should contain only numerical chars. And the first option looks way more user friendly

Additional context

I think there might be both back-end improvements and additional front-end input field validation. For instance it might allow only 0-9 to put into it or validate form before submission