Improve accessibility, better content Description values

[d4rken]

There are a few areas that are not optimal for users with visual impairments.

• Add content descriptions to floating action buttons on each tools page. Ensure description changes when the button switches functionality from scan to delete.

When choosing a particular tavb, for example 'corpse finder' when I swipe through, I hear talkback say 'unlabelled button', on each tab this is found immediately after the description of what the tool does.
If you turn on talkback and explore by touch under accessability you will quickly be able to hear exactly what I mean,