Month format:number to English abbre

```
DATA LV_MONTH TYPE FCKTX.
CLEAR:LV_MONTH,lv_date.

SELECT SINGLE KTX
INTO LV_MONTH
FROM T247
WHERE SPRAS EQ SY-LANGU
AND MNR EQ gs_header-print_date+4(2).
IF sy-subrc eq 0.
CONCATENATE gs_header-print_date+6(2)
lv_month gs_header-print_date+0(4)
INTO lv_date SEPARATED BY space.
ENDIF.

`20190412 -> 12 Apr 2019`