added last save location in settings

lib/l10n/app_en.arb

@@ -388,6 +388,16 @@
     "benutzername": "Username",
     "@benutzername": {
         "description": "intro screen benutzername hint"
+    },
+
+    "filelocation": "Location of the last saved file:",
+    "@filelocation": {
+        "description": "settings file location header"
+    },
+
+    "open": "Open",
+    "@open": {
+        "description": "open button"
     }
 
 }