CMFM: NL translation

ps1: Correct logic of string generation

ps2: - make copy/paste action more understandable
     - make use of plurals correctly
     - allow pluralization of selection string

ps3/4: remove plurals from strings.xml

ps5: fix weird sentence

Change-Id: I7676c4191402b002a9e72730f6b2f4c88899abe6