Make restoreprefs crystal clear about the meaning of *all*

No objections since 2011 to the simple proposal in comment 0.
Visual improvements can be performed at any time; given the
current position of the button, a slightly longer text is not
a problem.

Bug: 33327
Change-Id: Ia94e4989f40088aeace9391bfdf5137a8e3c26e8
Merge "Make restoreprefs crystal clear about the meaning of *all*"