add link to our privacy policy

_locales/en/messages.json

@@ -2440,7 +2440,7 @@
   },
   "ByUsingThisService...": {
     "message":
-      "By using this service, you agree to our <a>Terms and Conditions</a> and <a>Privacy Statement</a>"
+      "By using this service, you agree to our <a>Terms and Conditions</a> and <a href=\"https://getsession.org/privacy-policy/\" target=\"_blank\">Privacy Statement</a>"
   },
   "beginYourSession": {
     "message": "Begin<br />your<br />Session."

stylesheets/_session_signin.scss

@@ -199,6 +199,7 @@
     a {
       white-space: nowrap;
       font-weight: bold;
+      text-decoration: none;
       color: $session-color-light-grey;
       transition: $session-transition-duration;