When adding a transclusion link, not all anchors are listed

[EfraimFeinstein]

Affects v0.2.0 prerelease
See http://app.opensiddur.org/texts/%D7%90%D7%93%D7%99%D7%A8%20%D7%94%D7%95%D7%90
Add a transclusion link: note that the anchor end_refrain is not showing

[EfraimFeinstein]

anchors beginning with "begin_" and "end_" are not shown because they are conventionally internal anchors. This should be documented, but it isn't a bug