updated copyrights

res/layout/activity_home.xml

res/layout/activity_mgmt_accounts.xml

res/layout/credentials_pref.xml

res/layout/frag_call_list.xml

res/layout/frag_contact_list.xml

res/layout/item_contact.xml

res/layout/item_history.xml

res/layout/item_history_call.xml

res/values-fr/strings.xml

res/values/strings.xml

res/xml/account_advanced_prefs.xml

res/xml/account_audio_prefs.xml

res/xml/account_credentials.xml

res/xml/account_general_prefs.xml

res/xml/account_sdes.xml

res/xml/account_security_prefs.xml

res/xml/account_tls.xml

res/xml/account_zrtp.xml