made localization available to the users

* Setup the I18n system
* Detect user language
* Add locale switcher to footer
make the site better translatable

* Fix untranslatable content
* Fix concatenations
* Make image alt text translatable
* Use shortcut keys
Merge pull request #35 from diaspora/locale_switcher

made localization available to the users
fix locale in getting_started
Merge pull request #38 from svbergerem/fix-locale

fix locale in getting_started
fix locale in getting_started
Merge pull request #39 from svbergerem/fix-locale

fix locale in getting_started
fix typo
fix another typo