Plugin Multi-Lang Support

**Changelog:**
* Created "after_setup_theme" action.
* Added Multi-Language Support (path: /lang/).
* Added Russian translation.
* Created .POT file.

**Screenshot (ru_RU):**

![zm-login-lang](https://f.cloud.github.com/assets/3831204/2428384/08f6b89e-ac45-11e3-829d-c2e0c224f3fc.png)

**Additional:**
* New Plugin Version tag.
* Added "PHPStorm" to gitignore.