Restrictions for action buttons with text

Restrict action buttons with text to 2 lines max. Action buttons with
text will always consume at least 2 cells in split mode because they
look silly in 1.

Note that this affects text provided by menu items, not TextViews
embedded within app-provided action views.

Fixes bug 6236467

Change-Id: I7bcbf80f448b13a895ddc3bc6a7a555c0f0bac7c