Remove monochrome from battery icon while charging

Fixes #44 .  This is part of the fix.  Previously the charging state was
distinguished with the monochrome, but was too ambiguous.  Now we added
a Z lightinng bolt inside the icon.
Fix method name in journal multiple objects operation

This was a error in the implementation, the call do not match
the method name.

Signed-off-by: Gonzalo Odiard <godiard@sugarlabs.org>