Always use "." as decimal point, and " " as thousands separator.
Previously,
- for decimal point, we were using
- "." in some places (e.g. AmountEdit, most fiat amounts), and
- `locale.localeconv()['decimal_point']` in others.
- for thousands separator, we were using
- "," in some places (most fiat amounts), and
- " " in others (format_satoshis)
I think it is better to be consistent even if whatever we pick differs from the locale.
Using whitespace for thousands separator (vs comma) is probably less confusing for people
whose locale would user "." for ts and "," for dp (as in e.g. German).
The alternative option would be to always use the locale. Even if we decide to do that later,
this refactoring should be useful.
closes https://github.com/spesmilo/electrum/issues/2629
scenario: enter extremely high feerate (which we cannot satisfy) then click into fee_edit.
At that moment, fee_edit is empty and both feerate_edit and fee_edit are considered frozen.
As fee_edit has priority, we would construct a tx with default fee.
Now, instead, we won't construct this default fee tx ~as if the click to fee_edit did not happen.
