Add textSigle as a fetchable value for plugins

Change-Id: I53d25f153f159efed9863c575e8e6fa668618403
diff --git a/dev/js/src/plugin/server.js b/dev/js/src/plugin/server.js
index 589263f..ecf436c 100644
--- a/dev/js/src/plugin/server.js
+++ b/dev/js/src/plugin/server.js
@@ -503,6 +503,16 @@
           };
         }
 
+        // Get text sigle from match
+        else if (d.key == 'textSigle') {
+          if (service.panel.type != "match") {
+            KorAP.log(0, "Service can only be called on matches",  service.src);
+            return;
+          };
+          let v = d["value"] = {};
+          v["value"] = service.panel._match.textSigle;
+        }
+        
         // Get Query information from parameters
         else if (d.key == 'QueryParam') {