now detects incorrect password with sudo and su (at least in english)

lib/ansible/constants.py

@@ -151,6 +151,7 @@ DEFAULT_SUDO_FLAGS        = get_config(p, DEFAULTS, 'sudo_flags', 'ANSIBLE_SUDO_
 DEFAULT_ASK_SUDO_PASS     = get_config(p, DEFAULTS, 'ask_sudo_pass',    'ANSIBLE_ASK_SUDO_PASS',    False, boolean=True)
 
 # Become
+BECOME_ERROR_STRINGS      = {'sudo': 'Sorry, try again.', 'su': 'Authentication failure', 'pbrun': '', 'pfexec': '', 'runas': ''} #FIXME: deal with i18n
 BECOME_METHODS            = ['sudo','su','pbrun','pfexec','runas']
 DEFAULT_BECOME_METHOD     = get_config(p, 'privilege_escalation', 'become_method', 'ANSIBLE_BECOME_METHOD','sudo' if DEFAULT_SUDO else 'su' if DEFAULT_SU else 'sudo' ).lower()
 DEFAULT_BECOME            = get_config(p, 'privilege_escalation', 'become', 'ANSIBLE_BECOME',False, boolean=True)

lib/ansible/plugins/connections/__init__.py

@@ -129,6 +129,6 @@ class ConnectionBase(with_metaclass(ABCMeta, object)):
             return prompt(output)
 
     def check_incorrect_password(self, output, prompt):
-        incorrect_password = gettext.dgettext(self._connection_info.become_method, "Sorry, try again.")
+        incorrect_password = gettext.dgettext(self._connection_info.become_method, C.BECOME_ERROR_STRINGS[self._connection_info.become_method])
         return output.endswith(incorrect_password)