I hope it is a bug and not my missconfigurations.
I have Firefox configured to Spanish language.
Because I have always the Login button disabled, I was investigate why, and discovered each .es thas has include a script source, theys included as "src=shared.js" and not as I think is the correct way "src=shared.js.es"
I have fixing them manually for all spanish html file that include a script (except for config,js ofcourse).
I don't know if apache Multiviews deal with included files. As I can see, no.