org-exp.el: Add ukrainian language.

lisp/org-exp.el

@@ -207,6 +207,9 @@ This option can also be set with the +OPTIONS line, e.g. \"-:nil\"."
     ("ru" "Автор"      "Дата"  "Содержание" "Сноски")
     ("sv" "Författare" "Datum" "Innehåll" "Fotnoter")
     ;; Use numeric character entities for proper rendering of non-UTF8 documents
+    ;; ("uk" "Автор" "Дата" "Зміст" "Примітки")
+    ("uk" "Автор" "Дата" "Зміст" "Примітки")
+    ;; Use numeric character entities for proper rendering of non-UTF8 documents
     ;; ("zh-CN" "作者" "日期" "目录" "脚注")
     ("zh-CN" "作者" "日期" "目录" "脚注")
     ;; Use numeric character entities for proper rendering of non-UTF8 documents