Not translated "Please enter a valid email address (Ex: johndoe@domain.com)."

[pareshe]

In checkout with guest customer when enter invalid email address in "Email" field that time display this error and that is not translated.

[cpartica]

if you have a look at Magento/Ui/view/base/web/js/lib/validation/rules.js

$.mage.__('Please enter a valid email address (Ex: johndoe@domain.com).')

that means that error message is translated, but probably you don't have the right translation in your translation file, so it's not a Magento 2 issue, more of who's maintaining your language pack
You can manually add that into your language file

[pboisvert]

@pareshe were you able to resolve this issue by translating this string in your language pack? If so please close the issue or provide more details

[pareshe]

Please check this screen-shot:
http://awesomescreenshot.com/0f1600sw6a

[jernejh]

I am facing the same issue in Magneto 2.1.0.

I have the following line in sl_SI.csv:

"Please enter a valid email address (Ex: johndoe@domain.com).","Prosimo vnesite veljaven elektronski naslov (Primer: janez.novak@domena.si).",module,Magento_Ui

Magento is still not translating the string, despite I removed pub/static, var/cache, var/generation, var/page_cache, var/view_preprocessed folders and ran bin/magento setup:static-content:deploy sl_SI command and refreshed the cache.

[Tjitse-E]

Same issue here in Magento 2.1

[SchumacherFM]

Same issue in M2.1 :-(

Hope this fix is included in >= 2.1.1

[onepack]

Same here in M2.1
Translating Magento should have become easier with M2 but it has become a nightmare to get some simple stuff translated.
To get my theme translated I'm now working with 2 translation files. One general Magento i18n under app/i18n/locale/locale.csv and one in the theme.
As some strings (from .js files) are not translatable by my theme csv file like "Search entire store here" I ended up making the general magento translation file.
Also I might expect that a theme translation is always ruling and thus overruling the general magento translation but I found out that my theme translations were gone after I placed a general magento locale translation in app/i18n. So I stripped down that file to only contain what I cannot translate in my theme translation file like the .js strings.
And even with all these trials and errors, still johndoe is here to stay. Why...?

[shockwavemk]

Hi :)

The solution for most of this not translated errors in validation is the following library "mage/validation". Most of the returned messages do not call the mage translation method.

You can override the file with your own file by using a module with a requirejs-config:

/*jshint browser:true jquery:true*/
/*global alert*/
var config = {
    "map": {
        "*": {
            'mage/validation': 'YourVendor_CoreBugFix/js/model/validation',
        }
    }
};

You can translate every validation hint after surronding it with a $.mage.__('') method call:

$.mage.__('Please enter a valid email address (Ex: johndoe@domain.com).')

validation.js.txt

[onepack]

@shockwavemk
Yeah, I saw this solution a couple of times but in my opinion this should be translatable by a translation or theme translation. So without an extra module.
I will use this solution for the time being until it is solved in a coming M2 release.

[shockwavemk]

Some additional hint: some errors are still not translateable by default even if you surround all values in validation.js. For example: passwords have to be same.

To solve this issue just add an override of the method "equalTo" (jquery.validate.js) into the validation.js

   /**
     * Collection of validation rules including rules from additional-methods.js
     * @type {Object}
     */
    var rules = {
        "equalTo": [
            function (value, element, param) {
                // bind to the blur event of the target in order to revalidate whenever the target field is updated
                // TODO find a way to bind the event just once, avoiding the unbind-rebind overhead
                var target = $(param);
                if (this.settings.onfocusout) {
                    target.unbind(".validate-equalTo").bind("blur.validate-equalTo", function () {
                        $(element).valid();
                    });
                }
                return value === target.val();
            },
            $.mage.__('Please enter the same value again.')
        ],
        "max-words": ...