Spelling error

Fixes http://sentry.bikalabs.com/bikalims/bikalims/group/667/
Fix bad workflow condition in utils/sample

http://sentry.bikalabs.com/bikalims/bikalims/group/665/
Upgrade step for PriceList.

lineitem['VATTotal'] was renamed VATAmount
Prepare for release: 3.1
Update i18n strings