Add icon next to language selector

The image file is taken from
http://www.languageicon.org/ (http://archive.is/IvSz8)

Its licence, as stated on website, is "CC [Creative Commons] Relax-Attribution"
More specifically:
  - "You are suggested but not required to attribute the work when using for internet"
  - "copyright and hassle free"
  - "we will not disturb you for using our icon"

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![lang_icon](https://f.cloud.github.com/assets/2079110/1904334/484ccd80-7c8e-11e3-8933-3a04b144e6ae.png)