[openstreetmap-website] succint button copy + force single line grouped buttons (#389)

[Saman Bemel-Benrud]

This is a fix for #359 that forces text on to a single line. I also shortened the text for returning to inbox/outbox. 

Here is what happens now when you have very long button titles:
![screen shot 2013-07-29 at 7 48 00 pm](https://f.cloud.github.com/assets/108094/875681/51adaeda-f8a9-11e2-8385-b10c1bc12726.png)

You can merge this Pull Request by running:

  git pull https://github.com/samanpwbb/openstreetmap-website disallow-text-overflow

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/389

-- Commit Summary --

  * succint button copy + force single line grouped buttons
  * adding a little more max width for buttons.

-- File Changes --

    M app/assets/stylesheets/common.css.scss (5)
    M app/views/message/new.html.erb (2)
    M app/views/message/read.html.erb (2)
    M config/locales/en.yml (3)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/389.patch
https://github.com/openstreetmap/openstreetmap-website/pull/389.diff

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