Add COLUMN note to TABLE projects

db/migrate/20130418023533_add_note_to_projects.rb
- Newly created.
Correct locale key to "models" and "attributes" under "activerecord"

config/locales/ja.yml
- Correct key name "model" and "column_name" to official "models"
  and "attributes", respectively.
app/views/progresses/_form.html.erb
app/views/progresses/index.html.erb
app/views/projects/_form.html.erb
app/views/projects/_progress_list.html.erb
app/views/projects/_project.html.erb
app/views/projects/index.html.erb
app/views/users/_form.html.erb
- Follow the above corrections.