add slash and fix static issue

Author: Usik2203

app/code/Magento/Ui/view/base/web/js/lib/validation/rules.js

@@ -435,9 +435,9 @@ define([
         'validate-phone': [
             function (value) {
                 return utils.isEmptyNoTrim(value) ||
-                    /^[+]*[(]{0,1}[0-9]{1,4}[)]{0,1}[-\s\./0-9]*$/.test(value);
+                    /^[+]*[(]{0,1}[0-9]{1,4}[)]{0,1}[-\s\.\/0-9]*$/.test(value);
             },
-            $.mage.__('Please enter a valid phone number. For example (123) 456-7890, 123-456-7890, +(123)4567890, +1234567890')
+            $.mage.__('Please enter a valid phone number. For example (123) 456-7890, 123-456-7890, +(123)4567890, +1234567890')//eslint-disable-line max-len
         ],
         'validate-fax': [
             function (value) {