Include GELI, add i18n stubs for hdd encryption section

I think GELI should be a no-brainer for inclusion in this section because it is a built-in part of FreeBSD (which is already included).

While I was there I fixed a mistake (i18n-cloud-storage-note -> i18n-hdd-ssd-encryption-note) and added i18n stubs for all the strings.

IMPORTANT: the i18n JS doesn't work on my local system, so I was not able to test if there were any errors in the json files. Please check it before merging.