TBX: fix ref properties in the BFM import

the text title is not correctly displayed in the concordance references (ex: “null, 25, v. 5”)

(from redmine: issue id 780, created on 2014/05/07 by Matthieu Decorde)

added import type::bug + 1 deleted label

changed milestone to %TXM 0.7.6

closed

assigned to @mdecorde