Comment 10 for bug 1873119

Reviewed: https://reviews.mahara.org/11527
Committed: https://git.mahara.org/mahara/mahara/commit/8df346978c4af1f9dea4dc1b04cd9aea99968a65
Submitter: Robert Lyon (<email address hidden>)
Branch: master

commit 8df346978c4af1f9dea4dc1b04cd9aea99968a65
Author: Doris Tam <email address hidden>
Date: Mon Dec 21 09:24:28 2020 +1300

Bug 1873119: Adding artefact comments in the pdf export

Fix up formatting of comments on HTML export

Replace 'file' lang key calls to use to use the 'File' key instead so
I can use 'file' key to get 'file' string with lower caps along with
other plugin lang strings without lowercase titles to use mid-sentence.

Profile pictures in comments are not showing up - but unrelated to this
bug

Additional typos fixed

Removed the metadata class for comment privacy note

Change-Id: I5c2dc52670b4fcd83347eb56cb5ac743a13bc94f