Put back constant for passwordHelper.js

getConstant('VALIDATION_MESSAGE_PASSWORDS_MATCH') still exists in passwordhelper.js

Was previously removed here: portagenetwork@33a6058

app/views/layouts/application.html.erb

@@ -120,6 +120,7 @@
       MAX_NUMBER_GUIDANCE_SELECTIONS: 6,
 
       REQUIRED_FIELD_TEXT: _('This field is required.'),
+      VALIDATION_MESSAGE_PASSWORDS_MATCH: _('The passwords must match.'),
 
       SHOW_PASSWORD_MESSAGE: _('Show password'),
       SHOW_SELECT_ORG_MESSAGE: _('Select an organisation from the list.'),