Add I18n.locale for views cache
[Fixes #4673]
[Fixes #4678]
Fix FA class for picture

Oh, Picture-o, Picture-o

Fixes #4710
change precision for amount to 10

Fixes #4669
Drop not null constraint for amount in spree line items
fix typo in data-hook.
Closes #4718
fix font-awesome icons for admin taxons tree

Closes #4717