added error catch to saveFile

lib/addCam/add_cam_main.dart

@@ -331,10 +331,20 @@ class _AddCamMainState extends State<AddCamMain> {
     }
     await prefs.setString('saveDir', selectedDirectory);
 
-    File file = File('$selectedDirectory/cam-${id.text}.txt');
+    // ignore: use_build_context_synchronously
-
+    File file = File('$selectedDirectory/${AppLocalizations.of(context)!.justplace}-${standortC.text}.txt');
-    await file.writeAsString(jsonPlace);
 
+    try {
+      await file.writeAsString(jsonPlace);
+    } catch (e) {
+      // ignore: use_build_context_synchronously
+      Navigator.pop(context);
+      // ignore: use_build_context_synchronously
+      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+          // ignore: use_build_context_synchronously
+          content: Text(AppLocalizations.of(context)!.savefilefailed)));
+      return;
+    }
     // ignore: use_build_context_synchronously
     ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(content: Text('Datei gespeichert in $selectedDirectory')));

lib/l10n/app_de.arb

@@ -88,5 +88,7 @@
     "sendfile": "Datei zum Server senden",
     "pickfile": "Datei auswählen",
     "placedata": "Standortdaten",
-    "sent": "Gesendet"
+    "sent": "Gesendet",
+    "savefilefailed": "Fehler. Bitte nochmal versuchen",
+    "justplace": "Standort"
 }

lib/l10n/app_en.arb

@@ -427,6 +427,16 @@
     "sent": "Sent",
     "@sent": {
         "description": "view data sent header"
+    },
+
+    "savefilefailed": "Error. Please try again",
+    "@savefilefailed": {
+        "description": "save as file failed snackbar"
+    },
+
+    "justplace": "Place",
+    "@justplace": {
+        "description": "just the word place"
     }
 
 }