Fixed return working incorrectly when returning the initial sale multiple times
Fixed return quantity dropdown options being capped by selected amount
Exchange transactions can be returned now
Fixed transactions statistics columns overlapping
Added new language to POS available languages - English, Great Britain.
In English, United States language, renamed the tax rate input field in Product creation form from 'VAT Rate' to 'Tax Rate'. The new English, Great Britain, has the same field with the old translation - 'VAT rate'.
Added validation to sign up form and fixed validation message translation
Fixed issue where POS would attempt to save to JSON API even if it's not supposed to do so (no changes were made that would require the save to happen)