Functionality to finish a Progress in 'projects#show'

app/controllers/progresses_controller.rb
- Add finish().
app/models/progress.rb
- Add finish().
app/views/progresses/_progress.html.erb
- Add link to finish a Progress.
app/views/projects/_progress_list.html.erb
- Alter <th>'s colspan for the links.
config/locales/ja.yml
- Add "finish" under "helpers.link.progress", etc.
config/routes.rb
- Add member route 'finish' and 'make_today' to resources :progresses.