Use "L" key instead of "D" for deleting partitions at 1st setup stage

Use "L" key instead of "D" for deleting partitions in 1st text mode setup stage in "DeletePartitionPage" (after selecting partition and clicking "D" first on "SelectPartitionPage" and then passing "ConfirmDeleteSystemPartitionPage" when deleting the partition with ReactOS installed before that), same as it done in Win2k3.

Also update all translations accordingly with reverting and then converting them again to 8-bit clean string literals via code7bit tool: https://github.com/katahiromz/code7bit.