Adding patch for dirtying nested models
Fix locales for course
Merge branch 'feature/material_and_task_in_course' into staging
Setting right order of tabs in directory menu
Merge branch 'feature/material_and_task_in_course' into staging
Adding default_image
Merge branch 'feature/news_without_picture' into staging
Adding one inflector
Merge branch 'feature/session_and_pages_58_86' into staging