Mms: Move Mark as unread strings to the correct places

* Strings go to cm_strings
* Plurals go to cm_plurals
* Fixed plurals for CM standards

Change-Id: I7227c27039188202b376ecf50d79c9918c3b456a
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	res/values/cm_plurals.xml
	res/values/cm_strings.xml