make translations work

Change-Id: I36d35e6745b8955fe6c801963abd57267df85ac4
diff --git a/client/public/locale/en/translation.json b/client/public/locale/en/translation.json
new file mode 100644
index 0000000..19ddf26
--- /dev/null
+++ b/client/public/locale/en/translation.json
@@ -0,0 +1,4 @@
+{
+  "message_swarm_created": "Swarm created",
+  "message_user_joined": "{{user}} joined"
+}