Requirements acces to files with query strings (fixes #7735)

Originally authored by florian.thoma, tests added
by Ingo Schommer. Also removed query params from
file paths before calling mtime() on it.

See https://github.com/silverstripe/sapphire/pull/1023
Removed LOLCAT locale - sadly not supported by our translation infrastructure (fixes #1457)

It breaks the CMS when selected. If there's interest in maintaining it, we can re-add.