Settings: NL translations

ps4:
- translated HELP section
- included patch: Make menu item title and help text consistent.
ps6: include
- added contact icon
- volume keys control ringtone volume

cm-10.1 Change-Id: Ic693bd00b9d30aa1b09030a59418d4a331fdf1e9
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Patch set 2: Remove non-existing strings in cm-10.1-staging

Change-Id: Ia3b33e4b5cbc28928396b9e5f136837c5429c1aa