case insensitive search

server/ajax/task.go

@@ -54,7 +54,7 @@ func filterTags(tags []string) func(t *task.Task) bool {
 
 func filterSubstr(substr string) func(t *task.Task) bool {
 	return func(t *task.Task) bool {
-		found := substr == "" || strings.Contains(fmt.Sprintf("%+v %+v", t.Title, t.Tags), substr)
+		found := substr == "" || strings.Contains(strings.ToLower(fmt.Sprintf("%+v %+v", t.Title, t.Tags)), strings.ToLower(substr))
 		return found
 	}
 }