Update Twitter character count to 280

config/locales/en.yml

@@ -511,7 +511,7 @@ en:
       embed_ex2: "Note that the video/audio will only become embedded <em>after</em> you have posted your message, so you’ll have to refresh/reload the stream in order to see it. Occasionally it takes a while for the site which hosts the file you want to embed to respond with the embed information, so you might have to wait a short while and refresh the stream again."
       services: "Posting to other services"
       services_ex1: "If you have conntected your diaspora* seed to your accounts on other services, clicking on one or more of the icons for those services below the publisher means your message will appear on those networks as well."
-      services_ex2: "When you start writing a message with one of more of these icons highlighted, a character counter will show how many more characters are available to you: 140 for Twitter, 1000 for Tumblr, 63,206 for Facebook. In diaspora*, you can post a whopping 65,535 characters! The counter will always display the number of characters remaining for the service selected which allows the fewest characters; so, if you highlight both the Twitter and Facebook logos, it will count down from 140 characters."
+      services_ex2: "When you start writing a message with one of more of these icons highlighted, a character counter will show how many more characters are available to you: 280 for Twitter, 1000 for Tumblr, 63,206 for Facebook. In diaspora*, you can post a whopping 65,535 characters! The counter will always display the number of characters remaining for the service selected which allows the fewest characters; so, if you highlight both the Twitter and Facebook logos, it will count down from 280 characters."
       services_ex3: "If your message is longer than the figure allowed by the service you’re posting to, your message will appear truncated on that service, with a link to your post in diaspora*."
       how: "How about that? There’s plenty of things you can do in your posts in diaspora*."
       try_out: "To try it out, why not make a public announcement that you’ve just arrived in diaspora*? This is a good way to get welcomed by people in our community, and to start to make connections."