AKA:
Lang is 3 characters long. Entering 1 character would cause focus to leave.
MARC would also update incorrectly.
This only triggers the update when the full 3 characters are entered.
This not only prevents issues with catalogers editing multi-character fixed
fields but also makes it less likely they accidentally corrupt the records.
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org> Signed-off-by: Mike Rylander <mrylander@gmail.com>