Bug 8278 [Follow-up] Replace YUI autocomplete in UNIMARC 210c plugin

Bug 8278 [Follow-up] Replace YUI autocomplete in UNIMARC 210c plugin

This follow-up corrects the heading of the plugin pop-up window to match
the UNIMARC field it targets.

To test, trigger the plugin and confirm that the pop-up window refers to
210c.

Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Smple patch, fixes label. No errors.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
(cherry picked from commit e75fd34e92c599da8daa7ab40ef0153acbf05bf6)

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>