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"

Signed-off-by: Aleksandrs Ļedovskis <aleksandrs@ledovskis.lv>
Merge pull request #127 from aledovsky/feature/l10n_icon

Add icon next to language selector