Improving txt file download on frontend especially in relation to line numbers.

[richmanrachel]

Is your feature request related to a problem? Please describe.
This is a continuation of the work in #434. We are creating a temporary txt file download to allow researchers to copy/save transcriptions from the website to their own computers for research purposes.

The problems we've run into:

1. Adding line numbers is a necessity, but messes up the RTL encoding (don't know if that's the right word?)
2. Adding line numbers also creates problems for searching transcription phrases that go over line breaks

Describe the solution you'd like
Try to figure out a way for line numbers to be downloaded but not mess up search results or text direction.
Open to however we can accomplish this for MVP

[kseniaryzhova]

Irrelevant, closing!