First set of translations. Manual and Language Reference left

First set of translations, covering installation guides, home page and some translations within the `*.os` files themselves. All translations are found within `protected/views/SiteController/en`. Original russian files are left in tact for ease of further translation.

Should probably find a place where to put a "Translated by" mark... :)

Manual and Language Reference (`manual.*` / `langref.*`) are next. Approximately, 109 files are left to translate. I will send further pull requests set by set.