UX: copy and formating improvements to local-dates form (#7343)

plugins/discourse-local-dates/assets/javascripts/discourse/components/discourse-local-dates-create-form.js.es6

@@ -167,6 +167,14 @@ export default Ember.Component.extend({
     return moment.tz.guess();
   },
 
+  @computed("currentUserTimezone")
+  formatedCurrentUserTimezone(timezone) {
+    return timezone
+      .replace("_", " ")
+      .replace("Etc/", "")
+      .split("/");
+  },
+
   @computed("formats")
   previewedFormats(formats) {
     return formats.map(format => {

plugins/discourse-local-dates/assets/javascripts/discourse/templates/components/discourse-local-dates-create-form.hbs

@@ -1,5 +1,5 @@
 {{#d-modal-body
-  title="discourse_local_dates.create.modal_title"
+  title="discourse_local_dates.title"
   class="discourse-local-dates-create-modal"
   style="overflow: auto"}}
 
@@ -10,8 +10,7 @@
       </div>
     {{else}}
       <div class="preview alert alert-info">
-        <b>{{currentUserTimezone}}: </b>
-        {{currentPreview}}
+        <b>{{formatedCurrentUserTimezone}} </b>{{currentPreview}}
       </div>
     {{/unless}}