[phase-8]introduced security and authorization
[phase-7]add rendering sidebar to other views
[phase-6]changed routing of all glossary_term to under project
[phase-5]add category field to term index/detail view, and edit form
[phase-4]add delete operation
[phase-4]edit, update
[phase-3]use redmine's I18n#l method instead of Rails' I18n#t
[phase-3]add show action in minimum