Show message when switching to language with no results

src/components/DictionaryView.vue

@@ -249,8 +249,12 @@ export default {
                 })
               })
               self.article = null
-              self.error = null
-
+              if (! self.search_results.length) {
+                self.error = "Ordet «" + event.match + "» finnes ikke i ordbøkene"
+              }
+              else {
+                self.error = null
+              }
             })
             .catch(error => {
               self.search_results = []