fix aapt warnings + strings.xml corrections

remove unsused translations and make already translated
strings translatable.

Change-Id: Iacb7391ce27a373b369e349f28ed382a90f844fc
Settings: Wi-Fi country code

Change-Id: I8a078bde0ab40818784635477eb466510a1c230e

Conflicts:
	res/values/slim_strings.xml