Track words count instead of segment count for progress #150
Description
Currently, there is only segments count is tracked. It is not great, as segments have different words count each, and 100 short segments and 100 long segments might be very different, while still showing the same value. This is misleading and should be changed.
- For each segment, word count for source is calculated. It should not be super-precise, so it is not important to track all possible corner cases.
- Word count for each document is returned on a document endpoint to update UI controls.
- UI shows words count instead of segments count on index page.
- UI shows words count instead of segments count on document page.