added LTL Lithuanian Litas to Euro Converter

Reviewed-on: https://gerrit.libreoffice.org/11090
Reviewed-by: Thomas Arnhold <thomas@arnhold.org>
Tested-by: Thomas Arnhold <thomas@arnhold.org>
(cherry picked from commit 0b3e1d9b222bf045b03746f1c162bf8077a24a1b)
adapt SBCOUNTRYCOUNT
(cherry picked from commit 375228c2c811412b516fe29bf263a520f4e9be1a)
ditch unused sCurrUNKNOWN and sCurrSYSUNKNOWN strings
(cherry picked from commit 99e1b398f28ee8eb2fc2d6bf5db8362170f32e69)
increment SBCOUNTRYCOUNT again, we have 19 currencies 0..18
(cherry picked from commit dfb48f77ba011661e03b6eb942234adb4e6630d7)

Change-Id: Id4eeb42bbbaec979f60b57ddab2794b38f1e3157
Reviewed-on: https://gerrit.libreoffice.org/12952
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>