Disc is typically used for optical media, not hard disks (so unlikely
to encounter discs in mdraid related circumstances).
mdadm and friends use the disk spelling, the host script also shows
shows this `"disc_count": $(maybe_get "${mdadmSysDev}/md/raid_disks"),`
Fixing the variable names as well would be nice, but that change would
be a lot bigger and probably break things as it would need host script
adjustment synchronising and all that, but I think we can at least
change the cosmetic spelling.
https://en.wikipedia.org/wiki/Spelling_of_disc
* Fix bug introduced in 2016
Introduced when changing over from tables to divs.
Caused by commit: bda31d7152
* Apps: bring second menu bar in line with main menu
Scope limited to applications
* Style fixes
