i mustache you a question, but i'll shave it for you later.

app/views/templates/activity_streams_photo.handlebars

+<a href="{{object_url}}" class="stream-photo-link">
+  <img src="{{image_url}}" data-small-photo="{{image_url}}" data-full-photo="{{image_url}}" class="stream-photo" />
+</a>

app/views/templates/activity_streams_photo.jst

-<a href="<%= object_url %>" class="stream-photo-link">
-  <img src="<%= image_url %>" data-small-photo="<%= image_url %>" data-full-photo="<%= image_url %>" class="stream-photo" />
-</a>

public/javascripts/app/app.js

@@ -32,4 +32,9 @@ var app = {
   }
 };
 
-$(function() { app.initialize(); });
+$(function() { 
+  Handlebars.registerHelper('t', function(){
+    return Diaspora.I18n.t(arguments[0], jQuery.parseJSON(arguments[1]))
+  })
+  app.initialize();
+});

public/javascripts/app/views/content_view.js

@@ -23,6 +23,7 @@ app.views.Reshare = app.views.Content.extend({
 });
 
 app.views.ActivityStreams__Photo = app.views.Content.extend({
-  template_name : "#activity-streams-photo-template"
+  legacyTemplate : false,
+  templateName : "activity-streams-photo"
 });