Make sure strings get translated and that interpolation is safe

src/converse-controlbox.js

@@ -382,6 +382,7 @@
                 initialize (cfg) {
                     cfg.$parent.html(this.$el.html(
                         tpl_login_panel({
+                            '__': __,
                             'ANONYMOUS': _converse.ANONYMOUS,
                             'EXTERNAL': _converse.EXTERNAL,
                             'LOGIN': _converse.LOGIN,

src/templates/login_panel.html

 <div class="conn-feedback">
-    <p class="feedback-subject {{ conn_feedback_class }}">{{ conn_feedback_subject }}</p>
-    <p class="feedback-message {{ conn_feedback_class }}">{{ conn_feedback_message }} </p>
+    <p class="feedback-subject {{{ conn_feedback_class }}}">{{{ conn_feedback_subject }}}</p>
+    <p class="feedback-message {{{ conn_feedback_class }}}">{{{ conn_feedback_message }}}</p>
 </div>
 
 <form class="pure-form pure-form-stacked converse-form" id="converse-login" method="post">
@@ -27,5 +27,5 @@
 </form>
 
 <form class="pure-form pure-form-stacked converse-form" id="converse-register" method="post">
-    <p>Don't have a chat account? You can <a class="register-account">register an account</a></p>
+    <p>{{{ __("Don't have a chat account?") }}} <a class="register-account" href="#register">{{{__("Register an account here")}}}</a></p>
 </form>