OPP: Externalize user visible hardcoded strings to support localization.

Externalize hardcoded user visible strings in ENGLISH language for
Bluetotooth OPP sharing prompt from java file to strings.xml in
resource folder to support alternate resources for localization.

CRs-fixed: 496857

Change-Id: I660d08bf204879927caca30d16b06f6be7dd9d57
Merge "OPP: Externalize user visible hardcoded strings to support localization."
Merge remote-tracking branch 'caf/jb_2.5' into cm-10.1