share the same pre and post processing pipelines for Ja & En
This pull request **introduces 2 alerts** when merging 2a7441a7ca2cd2d9914cd41b68fbec872047e9ff into b467d6f20a13965e65522b3fbaf833b7cbf9f3ac - [view on LGTM.com](https://lgtm.com/projects/g/NVIDIA/NeMo/rev/pr-3cdfd9c5b9dcc8e2bbebd0e0aa3b259abcb75ea0)

**new alerts:**

* 2 for Variable defined multiple times
The current japanese and english pre and post processing pipelines are shared. However, that wasnt reflected in the nemo code. This PR rectifies this discrepancy and makes sure english is processed the same way as japanese text is whenever the source or target language is the latter.