GRN-86: Change the way the locales are handled (#417)

* Changed the way locales are shown

* Updated the rest of the locales

* Changed the way available_locales are defined

* Updated locales in Russian

* Updated locaales for German

config/locales/en.yml

@@ -86,18 +86,8 @@ en:
     video: Watch our tutorial on using Greenlight
     upgrade: Show me how to upgrade to 2.0!
     version: We've released a new version of Greenlight, but your database isn't compatible.
-  language_options:
-    default: Default (browser language)
-    ar: Arabic
-    de: German
-    el: Greek
-    en: English
-    es: Spanish
-    fr: French
-    pt: Portuguese
-    pt-br: Portuguese (Brazil)
-    ru: Russian
-    zh-cn: Chinese (PRC)
+  language_name: English
+  language_default: Default (browser language)
   ldap_error: Unable to connect to the LDAP server. Please check your LDAP configuration in the env file and ensure your server is running.
   login: Sign in
   max_concurrent: The maximum number of concurrent sessions allowed has been reached!