Fix typos in _variables.scss and _variables_override.scss

Fixes #3338
admin shipping labels maps. fix spree/spree#3298 there is no need for mapping directly of label to checkbox id, decided to nest checkboxes inside the labels instead

Fixes #3340
Fixes #3298
Makes cvv_response optional

Fixes #3330
[backend] Remove ability to edit/update/destroy StockMovements

Fixes #3280
Remove .select(field) from permalinks.rb#save_permalink; gloabalize3 modifies the statement for the models

Fixes #3343
Fixes #3329