GUACAMOLE-323: Add translation file; hide ticket field header.

extensions/guacamole-auth-cas/src/main/resources/translations/en.json

@@ -0,0 +1,12 @@
+{
+
+    "DATA_SOURCE_CAS" : {
+        "NAME" : "CAS SSO Backend"
+    },
+
+    "LOGIN" : {
+        "FIELD_HEADER_TICKET"        : "",
+        "INFO_CAS_REDIRECT_PENDING"  : "Please wait, redirecting to CAS authentication."
+    }
+
+}