Add a send smtp test email button in admin panel

[nztqa]

Add a send smtp test email button in admin panel

---

This change is 

[ocdtrekkie]

Given how many SMTP related issue filings I've seen, and the fact that every other tool I've used that includes SMTP config includes a button to test it, I am 100% in favor of this PR.

[xet7]

@nztqa

Is it possible to change error to be shown directly on admin panel ?

[nztqa]

@xet7

use a shorthand method. alert

--- a/client/components/settings/settingBody.js
+++ b/client/components/settings/settingBody.js
@@ -129,8 +129,10 @@ BlazeComponent.extendComponent({
     Meteor.call('sendSMTPTestEmail', (err, ret) => {
       if (!err && ret) { /* eslint-disable no-console */
         console.log('Success:', ret.message, ret.email);
+        alert('Success');
       } else {
         console.log('Error: Sending test email', err);
+        alert(err);
       }  /* eslint-enable no-console */
     });
   },

[xet7]

@nztqa

Please add that alert code to this pull request.

[xet7]

@nztqa

Please make all user visible text, like Success, errors, email text, etc translateable, and add those changes to this pull request.

[nztqa]

Finished