Hint that something is happening when user submits status message via publisher

Basically, right side of service icons, we use an ajax loader that appears when submitted and disappears after success/error. The button is also disabled, but blueprint doesn't show that - Bootstrap styles it differently. Fixes #4949.

Also added a flash message in case the server reports an error. Otherwise the publisher gave no hint on error, just kept form open and active without saying anything to user.

![pic](http://i.imgur.com/idpe8OD.png)
![pic](http://i.imgur.com/0LX2SmG.png)

Btw, the moving of some strings around in the JS locales was needed since the poll locales for publisher overwrote the earlier defined publisher locales.