Allow sprint names in Bulk Change > Change Sprint

In JIRA v6.4.3#64018-sha1:4550402, using Bulk Change to change the sprint, one has to use the internal JIRA ID for the sprint instead of the sprint name. In most of the other fields I've worked with (e.g., JQL search) typing a field name will create a drop-down menu of options. The Change Sprint field should do this as well.

BTW, I use the JQL search to determine the Sprint ID for the Bulk Change screen; this is a really clunky work-flow.