Add configuration option for Presenter's manual

src/main/java/de/thm/arsnova/controller/ConfigurationController.java

@@ -68,6 +68,9 @@ public class ConfigurationController extends AbstractController {
 	@Value("${links.documentation.url}")
 	private String documentationUrl;
 
+	@Value("${links.presenter-documentation.url}")
+	private String presenterDocumentationUrl;
+
 	@Value("${features.mathjax.enabled:true}")
 	private String mathJaxEnabled;
 
@@ -114,6 +117,9 @@ public class ConfigurationController extends AbstractController {
 		if (!"".equals(documentationUrl)) {
 			config.put("documentationUrl", documentationUrl);
 		}
+		if (!"".equals(presenterDocumentationUrl)) {
+			config.put("presenterDocumentationUrl", presenterDocumentationUrl);
+		}
 		if (!"".equals(overlayUrl)) {
 			config.put("overlayUrl", overlayUrl);
 		}

src/main/resources/arsnova.properties.example

@@ -194,6 +194,7 @@ question.parse-answer-option-formatting=false
 # Links which are displayed in the frontend applications
 #
 links.documentation.url=https://arsnova.eu/manual/
+links.presenter-documentation.url=
 links.overlay.url=https://arsnova.eu/overlay/
 links.organization.url=
 links.imprint.url=

src/test/resources/arsnova.properties.example

@@ -194,6 +194,7 @@ question.parse-answer-option-formatting=false
 # Links which are displayed in the frontend applications
 #
 links.documentation.url=https://arsnova.eu/manual/
+links.presenter-documentation.url=
 links.overlay.url=https://arsnova.eu/overlay/
 links.organization.url=
 links.imprint.url=