Move localecache to array
Move localecache to array

It seems the DS Set in the polyfill implementation is a lot less
efficient than normal arrays. (A LOT!).
So for now use a stupid normal array.

Signed-off-by: Roeland Jago Douma <982d370f7dc34a05b4abe8788f899578d515262d@famdouma.nl>

nextcloud/server,andreas-p/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,nextcloud/server,nextcloud/server,andreas-p/nextcloud-server