fixed new tense structure in next-resourc/demo

lib/next-resource/demo/DemoDan.gf

@@ -0,0 +1,16 @@
+--# -path=.:alltenses
+
+concrete DemoDan of Demo = 
+  NounDan,
+  ClauseDan,
+  AdjectiveDan,
+  AdverbDan,
+  NumeralDan,
+  QuestionDan,
+  StructuralDan,
+  LexiconDan
+  ** {
+
+flags language = da; unlexer = text ; lexer = text ;
+
+} ;