OpenXML Filter: DOCX: make possible numbering level texts translation

We funded the development of

https://bitbucket.org/okapiframework/okapi/issues/1313

that has the same content and purpose as this issue here.

It has been released with Okapi 1.46.

The new config funded by us is listed here

http://okapiframework.org/wiki/index.php?title=OpenXML_Filter

and called "Translate Numbering Level Text"

We need to make this work and configurable in translate5.