DRY up and i18n progress bar code

Based on comments on an earlier commit, this code has been improved by
condensing the logic and removing the 'locale' parameter from a call to
'number_to_percentage'.
Remove unnecessary argument in ProjectsController#create

When fixing a bug with the system message returned on the successful
creation of a project, an argument was added to the i18n string
generation that was not needed.

This removes the extra argument.
Merge pull request #122 from flarnie/fixing_bug_fixes

Fixing bug fixes