Bug 1018321 - Create url to one and done profile page based on username or name

This is another case of translating a string that has nothing but a substitution variable in it; this will have no effect as there's nothing for localizers to translate. 

Also note how, in the line below, you have some translated text immediately after the number. You have to keep this all in one string: `{count} Tasks Completed`.

The Jinja2 docs have some examples of how to translate statements that involve a count using the `{% pluralize %}` tag: http://jinja.pocoo.org/docs/templates/#i18n