Fix: AWS SES Mailer (#365)

As reported on issue #357, the aws ses configuration was not able to
store because of the missing `ses` service config. Additionally was
added a `AWS Region` field to be used by the `ses`.

closes #357

lang/uk.json

@@ -893,6 +893,7 @@
       "mailgun_endpoint": "Mailgun Endpoint",
       "ses_secret": "SES Secret",
       "ses_key": "SES Key",
+      "ses_region": "AWS Region",
       "password": "Mail Password",
       "username": "Mail Username",
       "mail_config": "Mail Configuration",