[fix] corrected language display in user view
[evol] language can be forced in the user admin page (closes #6) (no user interface yet)
[evol] an artwork can have multiple materials
[fix] renamed 'technique' into more appropriate name 'artwork_support', and update schema and translations (Closes #4)
[evol] created a simple logon system, protected admin pages, and added a logon indicator/link (no user management yet, only a deadend entry in the menu if admin)
[fix] corrected typo (closes #2)
[fix] don't call the final artwork image a 'step', and use italic characters
[lang] updated french translation and french application title
Initial version