[evol] added tags and fixes a few typos
[evol] an artwork can have multiple materials
[fix] renamed 'technique' into more appropriate name 'artwork_support', and update schema and translations (Closes #4)
[fix] added 'selected' parameter to artwork size generic selector and pass currently selected size in artwork edit page (closes #1)
[fix] remove hardcoded submit label in display_standard_form_buttons() helper and propagate submit_label view variable to it
Initial version