added Lithuanian "LTL" to EUROCONVERT(), CONVERT()

Change-Id: Iefde129177df827c4b6508ff190f20e1e1973221
Reviewed-on: https://gerrit.libreoffice.org/11088
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>