Bug 14832: Fix encoding issues when exporting in RIS

Bug 14832: Fix encoding issues when exporting in RIS

Test plan:
1/ Make sure you have non ASCII chars in the title and the authors.
2/ Export the record in RIS
You should not see any encoding problems.

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Before patch: RIS file has wrongly encoded chars
After patch: RIS file has no endcoding problems
Tested on a NORMARC setup.

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Tested on a MARC21 and a UNIMARC database.
Problem only confirmed for UNIMARC, but no regressions in MARC21.
Signed-off-by: Tomas Cohen Arazi <tomascohen@unc.edu.ar>