Make text choose encoding
See thread here: http://lists.freedesktop.org/archives/libreoffice/2013-November/057337.html

Change-Id: I1de7c24f8be8a7d1142275311f94b6e4e7800229
Reviewed-on: https://gerrit.libreoffice.org/7487
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>