Just a minor issue, but one that is more admin than tech:

Since the en.ini file has been improved (grouping etc.) recently, other language files are getting more out of date. Also, since en.ini now used references like "top_facet_additional_prefix", this can look more buggy in the non-English interface than the plain English fail-over did until now.

A few question:
I will commit and offer to maintain an Irish (Gaeilge) file, but it is unlikely to be in high demand ;)