NOTE: This is lower priority for the Community Tech team, but perhaps it can be picked up by someone else or another team, now or in the future.
Background: Wikisource readers online can choose which orthography to select, but this is not available for ebook exports. The fix for this may be a large project that is out of scope for the current project. However, it’s good for us to still know about this issue, and we would like to document it in Phabricator.