Replace more vendor naming

Signed-off-by: Joas Schilling <coding@schilljs.com>

core/js/setupchecks.js

@@ -124,7 +124,7 @@
 					}
 					if(!data.forwardedForHeadersWorking) {
 						messages.push({
-							msg: t('core', 'The reverse proxy headers configuration is incorrect, or you are accessing ownCloud from a trusted proxy. If you are not accessing ownCloud from a trusted proxy, this is a security issue and can allow an attacker to spoof their IP address as visible to ownCloud. Further information can be found in our <a target="_blank" rel="noreferrer" href="{docLink}">documentation</a>.', {docLink: data.reverseProxyDocs}),
+							msg: t('core', 'The reverse proxy headers configuration is incorrect, or you are accessing Nextcloud from a trusted proxy. If you are not accessing Nextcloud from a trusted proxy, this is a security issue and can allow an attacker to spoof their IP address as visible to Nextcloud. Further information can be found in our <a target="_blank" rel="noreferrer" href="{docLink}">documentation</a>.', {docLink: data.reverseProxyDocs}),
 							type: OC.SetupChecks.MESSAGE_TYPE_WARNING
 						});
 					}

core/js/tests/specs/setupchecksSpec.js

@@ -309,7 +309,7 @@ describe('OC.SetupChecks tests', function() {
 
 			async.done(function( data, s, x ){
 				expect(data).toEqual([{
-					msg: 'The reverse proxy headers configuration is incorrect, or you are accessing ownCloud from a trusted proxy. If you are not accessing ownCloud from a trusted proxy, this is a security issue and can allow an attacker to spoof their IP address as visible to ownCloud. Further information can be found in our <a target="_blank" rel="noreferrer" href="https://docs.owncloud.org/foo/bar.html">documentation</a>.',
+					msg: 'The reverse proxy headers configuration is incorrect, or you are accessing Nextcloud from a trusted proxy. If you are not accessing Nextcloud from a trusted proxy, this is a security issue and can allow an attacker to spoof their IP address as visible to Nextcloud. Further information can be found in our <a target="_blank" rel="noreferrer" href="https://docs.owncloud.org/foo/bar.html">documentation</a>.',
 					type: OC.SetupChecks.MESSAGE_TYPE_WARNING
 				}]);
 				done();