Dictionary Diffs: make deletions readable

[kcullion]

• remove strikethrough on hover of red deleted data, so user can read it to compare

[kcullion]

or we could make the strikethrough colour lighter so it still looks like it's a removed item.
something like: https://stackoverflow.com/questions/1107551/css-strikethrough-different-color-from-text
using color:#BABCC2