Rename ownCloud to Nextcloud in safe places

e.g. code comments and user-facing prompts/outputs which can be safely changed without risking to break anything

conf/nginx-alldomains.conf

@@ -70,7 +70,7 @@
 	# takes precedence over all non-regex matches and only regex matches that
 	# come after it (i.e. none of those, since this is the last one.) That means
 	# we're blocking dotfiles in the static hosted sites but not the FastCGI-
-	# handled locations for ownCloud (which serves user-uploaded files that might
+	# handled locations for Nextcloud (which serves user-uploaded files that might
 	# have this pattern, see #414) or some of the other services.
 	location ~ /\.(ht|svn|git|hg|bzr) {
 		log_not_found off;

conf/nginx-primaryonly.conf

@@ -12,7 +12,7 @@
 		add_header Strict-Transport-Security max-age=31536000;
 	}
 
-	# ownCloud configuration.
+	# Nextcloud configuration.
 	rewrite ^/cloud$ /cloud/ redirect;
 	rewrite ^/cloud/$ /cloud/index.php;
 	rewrite ^/cloud/(contacts|calendar|files)$ /cloud/index.php/apps/$1/ redirect;
@@ -47,7 +47,7 @@
 		fastcgi_buffers 64 4K;
 	}
 	location ^~ /owncloud-xaccel/ {
-		# This directory is for MOD_X_ACCEL_REDIRECT_ENABLED. ownCloud sends the full file
+		# This directory is for MOD_X_ACCEL_REDIRECT_ENABLED. Nextcloud sends the full file
 		# path on disk as a subdirectory under this virtual path.
 		# We must only allow 'internal' redirects within nginx so that the filesystem
 		# is not exposed to the world.

conf/zpush/backend_carddav.php

@@ -17,7 +17,7 @@ define('CARDDAV_CONTACTS_FOLDER_NAME', '%u Addressbook');
 define('CARDDAV_SUPPORTS_SYNC', false);
 
 // If the CardDAV server supports the FN attribute for searches
-// DAViCal supports it, but SabreDav, Owncloud and SOGo don't
+// DAViCal supports it, but SabreDav, Nextcloud and SOGo don't
 // Setting this to true will search by FN. If false will search by sn, givenName and email
 // It's safe to leave it as false
 define('CARDDAV_SUPPORTS_FN_SEARCH', false);