Yoruba sample text issue (or glyphset issue?)

[Rosalie Wagner]

@moyogo inspecting the changes of #16 in sandbox, some glyphs are still falling back to another fonts

I don't remember if this is this kind of issue:
o dotbelow _ acutecomb instead of o acute _ dotbelowcomb (but I don't think it should change anything in term of text composition)

Or if it is because the comb accents are missing from the Latin .nam glyphset.

[Victor Gaultney]

This remains a major issue with all our Latin fonts, and there seems to have been no progress since October. See google/fonts#5385