remove invalid spanish translation key
remove invalid spanish translation key

in the new discussions we changed a key that used to have an interpolated value
to one that no longer has one.  Since the spanish translation lags a bit, this
causes an error until the new translation is done.

test-plan:
- in a course that has a dashboard entry about a graded discussion topic
- switch course locale to spanish
- make sure the dashboard loads

Change-Id: Ia41fe4b40ec08ad5de78005e4b3a42d007c2c036
Reviewed-on: https://gerrit.instructure.com/9837
Reviewed-by: Jon Jensen <44f878afe53efc66b76772bd845eb65944ed8232@instructure.com>
Tested-by: Hudson <dfb64870173313a9a7b56f814c8e3b33e268497a@instructure.com>

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