Setting default mode for views always.

Changed default behaviour. Now, language conditions are applied unless there's some exposed language filter.

+ Added extended language support for content (All defined languages can be selected for some content types)
+ Improved language management to localize language names
+ Implemented 'hook_language_list' so node modules can define its own language list now
+ Fixed issues with 'strict' language selection mode
+ Fixed module weights (run update.php)