Stock transfers index
Log entry index table class
Stock transfer showpage
Stock transfers: added the data-variant-id to the icon as well

Because the span is in the button, sometimes the event.target is the
span and sometimes it is the button. If we add the variand-id too both
there is always and variant-id.
Shipping cat index
Replaced and added some bootstrap classes to forms
Classes to preference fields
Shipping methods index and edit page
Replaced classes on error messages
Add taxonomy page
Payment method form and index
Replaced all 'select2 fullwidth' classes with 'select2'
Replaced select2 spinner with busy indicator div

Maybe create a helper of partial for this later
States index form and index
Deleted loading spinner from states index

See https://github.com/spree/spree/pull/5402
Country index and form
Zone index and form
Replaced "select2 fullwidth" with "select2"
Deleted unnecessary line breaks
Layout stock locations form