#842 Multi-language: created data structure and site settings culture managing
#842 Removed updating of pages table
#842 Added authorize attribute in cultures controller
#842 Created structure for multilingual pages; added cms.config value for multi languages; added ability to edit culture when creating / editing page;
#842 Multilanguage: started creating grid for page translations
#842 Pages: added filtering by culture
#855: content region multiple occurrences fixed.
Merge branch 'dev_1.4.0_fix855'
#842 Created page selection modal and ability to select a page from page translations tab
#842 Created cloning of current page when translating to another language
#842 Created ability to select main culture page when creating page / editing page properties
#842 Fixed page cloning command tests
#842 Cultures grid: autocomplete selector added directly to grid
#856 When replacing contents with regexp, escaping replacements
#842 Page properties: UI / server-side modifications of translations assignments to page
#842 Re-factored database, created grouping culture Id, which is used for linking between pages
removed deprecated css properties. Issue #839
fixed Issue #845
fixed Issue #715
fixed Issue #520