In the issue MDL-39319 (6ddf92c77), the ability to uninstall multiple
language packs at once was added. By a mistake, the PARAM_ALPHAEXT was
used as paramater type for the dash-separated list of language packs to
be uninstalled. Language packs with a number in the name (such as
en_us_k12) do not pass the ALPHAEXT cleaning.
This patch changes the parameter cleaning to PARAM_SAFEPATH which is
more appropriate for the given scenario as language code themselves must
be SAFEDIRs.
David Mudrák
a27fa5b50e