In order to produce a consistent build across the board, we must hardcode
several package versions. We must additionally specify compatible
versions for any sub-dependency that we have a requirement upon.

In this instance, the only sub-dependency which has an effect upon the
overall output is grunt-contrib-uglify's dependency upon uglify-js.

Since change in uglify-js may lead to changes in the generated output, we
must specify a fixed version of that dependency. That version must be
compatible with the dependency signature for grunt-contrib-uglify or the
dependency manager will just download a different version.

This issue also bumps the version of uglify-js to a version which changes
the output. This is the latest version at time of commit.

contains might select wrong activity
so using strict activity text checking

Thanks to Francesco Bigiarini for the report and suggested fix.

When additional names are disabled, they are no longer shown as
sortable headings in the enrolment and admin user tables.