Convert alternative translations with prev/next context to ID-bound translations

[msoutopico]

This is a request for a new script that retrieves alternative translations when the type of context changes.

Background

When you change the XLIFF filter context option from prev/next to segment ID, all existing alternative translations are gone and need to be restored.

Expected functionality

In a project where the context option has been changed from prev/next to something else, the script finds any orphan translations with prev/next context in the working TM.

If there are any, it takes the orphan translation, finds the segment in the project that corresponds to that prev/next context, and then registers the orphan translation as the (ID-based) alternative translation of that segment.