Clarify the ambiguity of the "more actions" dropdown.

Adds the word "More" to the dropdown toggle to clearly indicate
what the arrow is for. Also disables line-wrapping between the
primary action and its dropdown toggle. Removes the individual
hacks for the widths of various tables.

Change-Id: I74c03a9cd0655457f85332c9c7d31ef3ae15059e
Merge "Clarify the ambiguity of the "more actions" dropdown."