Incorrect display of some sizes in Tracker

[madmax]

string_for_size returns localized numbers after hrev57672, which means we can't count on a dot as decimal separator. If you choose a locale with a dot as thousand separator, like Spanish, and have a file bigger than 1KiB that would use it you'll lose a 0 in the tens, if there's one. For example, a file of 1023995 bytes shows as "1.00,00 KiB", and 1034234 turns into "1.09,99 KiB".

Only happens in folder windows, not in info panes. See ​TruncFileSizeBase.

[waddlesplash]

I guess we need to use BNumberFormat::GetSeparator here? Or expose a new API so that BNumberFormat can do the right thing automatically (by setting only the maximum precision, and leaving minimum at 0?) Or, just use a private API for this method?

[waddlesplash]

Fix merged in hrev57731.