Latex filter not applied to group

[billbrod]

The latex bibtex-ruby formatting filter (and probably the others?) does not appear to be applied to the text that gets produced for grouping. When I use the following bib file:

@inproceedings{Henaff15a,
	title = {The local low-dimensionality of natural images},
	author = {H\'{e}naff, O J and Rabinowitz, N and Ball\'{e}, J and Simoncelli, E P},
	booktitle = {Int'l Conf on Learning Representations (ICLR)},
	address = {San Diego, CA},
	month = {May},
	year = {2015},
	url = {http://arxiv.org/abs/1412.6626},
}

with the following configuration:

scholar:
  group_by: author
  sort_by: year,month
  order: descending

I get the following:

You can see the accents are correctly rendered in the reference string, but not the h2 text at the top.