Move system folder string resources to emailcommon.

Also rename emailcommon2 to emailcommon.

This is a multi-project submit with
I6c6eec4f1bcf2abd54c1ed05da1add8d894ee403 and
I5746c0353783f9b29d52d6540472588c6542a6a2

Change-Id: I4a071a07c3e33aaa4ea404eb66a8db1eabc9ef0e
1 file changed