Renamed misnamed WET theme files

The French and English versions of cont-nositemenu-*.html were inconsistent with the naming scheme of the Spanish and Arabic versions (cont-nositemenubc-*.html), as well as the GC Intranet theme's similar files.

Existing links to the French/English versions of these files were also using the "bc" part in the destination file names (resulting in broken links). Figured I'd rename the files to sort it out.