Closes #1386. On conversations, disable Reply button once pressed

app/views/conversations/_show.haml

@@ -29,4 +29,4 @@
         = form_for [conversation, Message.new] do |message|
           = message.text_area :text, :rows => 5, :tabindex => 1
           .right
-            = message.submit t('.reply').capitalize, :class => 'button creation', :tabindex => 2
+            = message.submit t('.reply').capitalize, :disable_with => t('.replying'), :class => 'button creation', :tabindex => 2

config/locales/diaspora/en.yml

@@ -233,6 +233,7 @@ en:
       inbox: "Inbox"
     show:
       reply: "reply"
+      replying: "Replying..."
       delete: "delete and block conversation"
     new:
       to: "to"