Added `rake translatable:find` ...

ran gettext:find and fixed up en_US translations

added translatable:find task and fixed up a few files

added exception to po/pot backup files in gitignore

began fixing up pt_BR

added pt_BR translations

fixed issue with multiline translatable text on help page. reran translatable:find and fixed up app.pot, pt_BR, en_US and en_GB

fixed test

fixed another test

updated author comments

added devise and bootstrap translations for pt_BR