add missing join to document_data
Merge branch 'master' of github.com:/rapila/plugin-schulcms
improve position of add_entry button
replace label name by a more comprehensive one
refactor class and related widget

• include all lists as list widgets, refactor them to use the new SpecializedListWidgetModule wrapper
• add related js files
• make input widget call asynchroneous
• cleanup css, make use of global rules