Fix bug in ServiceFactory call

src/app/services/internationalisation.service.ts

@@ -193,8 +193,7 @@ export class I18nService extends Observable implements Observer {
 
         // replace "FORM_ID_X" by form name in current session, if any
         m = m.replace(/FORM_ID_(\w{6})/g, (match, p1) => {
-            // cannot inject FormulaireService => cyclic dependency :/
-            const form = ServiceFactory.instance.formulaireService.getFormulaireFromNubId(p1);
+            const form = ServiceFactory.formulaireService.getFormulaireFromNubId(p1); // cannot inject FormulaireService => cyclic dependency :/
             let formName = "**UNKNOWN_FORM**";
             if (form !== undefined) {
                 formName = form.calculatorName;