Translate German variable names

Akt -> Current
Zustand -> STATE
Ende -> End

in Excel filter (read)

Change-Id: I4bbb59fb8de1b59ecb4c8fd1ce0765e654acd10f
Reviewed-on: https://gerrit.libreoffice.org/49193Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Markus Mohrhard <markus.mohrhard@googlemail.com>