* develop-olympus: (21 commits) [feature/notify_status] Define'd constants for notify_status [ticket/7782] Send 404 HTTP code when a nonexistent user/forum/topic is requested. [ticket/9530] The prosilver problem in #9531 exists in subsilver2 editor.js [ticket/9530] Subsilver2 is missing BBCode-less quotes fallback-option when bbcodes are disabled. [ticket/9531] BBCode-less quotes fallback-option is missing "Author wrote:" line when quoting from topic-review. [ticket/9547] Use separate constants for display/enable active topics. [ticket/9535] Also fix the margin in the install_update.html [ticket/9535] Fix some more rtl margin issues. [ticket/9535] Correctly set margin of textarea in ACP > Users signature for RTL languages. [ticket/9524] IPv6 regex does not match all valid IPv6 addresses starting with :: [ticket/9510] Unable to copy permissions from and to forums you cannot see [ticket/9510] Unable to copy permissions from and to forums you cannot see [ticket/9545] Initial forum should display active topics by default. [ticket/9546] Also delete bookmarks, when a topic is deleted. [ticket/9529] Topic review is not showing all selected posts. [ticket/9528] Also fall back to bbcode-less quotes for PMs, when bbcodes are disabled. [ticket/9146] Fix double occurring tabindex="6" in prosilver's QR [ticket/9119] Respect language selection on automated update. [ticket/8894] Fix JavaScript-Error and hide Quote-Button on topic review if BBCodes are not allowed. [ticket/9567] Newly registered users group description rewording. ...