Change text of registration to enrollment

[ECOM-463](https://openedx.atlassian.net/browse/ECOM-463)

Reviewers: @dianakhuang @srpearce 

@sarina When is the best time to merge this relative to the release process to avoid breaking translations?
Sylvia: Don't review the translations files.

Will: I would avoid checking in translation files - it makes your diff
larger and can be confusing to reviewers.
On Oct 14, 2014 1:32 PM, "srpearce" <notifications@github.com> wrote:

> In conf/locale/eo/LC_MESSAGES/django.po:
>
> > @@ -1900,8 +1911,15 @@ msgid "Cohort Configuration"
> >  msgstr "Çöhört Çönfïgürätïön Ⱡ'σя#"
> >
> >  #: common/lib/xmodule/xmodule/course_module.py
> > -msgid "Cohorts are not currently supported by edX."
> > -msgstr "Çöhörts äré nöt çürréntlý süppörtéd ßý édX. Ⱡ'σяєм ιρѕυм#"
> > +msgid ""
> > +"Enter policy keys and values to enable the cohort feature, define automated "
> > +"student assignment to groups, or identify any course-wide discussion topics "
>
> Not sure what "define automated student assignment to groups" means -
> could this be "define the ways students are automatically assigned to
> groups"?
>
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> <https://github.com/edx/edx-platform/pull/5567/files#r18844279>.
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