Clarify options for selecting the type of work for new datasets

Hi Johannes, please take a look if this helps to clarify the choice for our users. Especially the notion of "CRC Dataset" without further explanation or reference to CRC 1280 is confusing.

hyrax/config/locales/crc_dataset.en.yml

@@ -11,8 +11,8 @@ en:
       crc_dataset:     'fa fa-file-text-o'
     select_type:
       crc_dataset:
-        description:        "CRC dataset works"
-        name:               "CRC Dataset"
+        description:        "Exclusive to CRC 1280 Extinction Learning"
+        name:               "CRC 1280 Dataset"
     crc_datasets:
       attribute_rows:
         edit:               "Edit"