web/TransferSettings: friendlier error messages

web/i18n/en/error.json

@@ -0,0 +1,5 @@
+{
+    "import.no_data": "there's nothing to load from the file. are you sure it's the right one?",
+    "import.invalid": "your file doesn't have valid cobalt settings to import. are you sure it's the right one?",
+    "import.unknown": "couldn't load data from the file. it may be corrupted or of wrong format. here's the error i got:\n{{ value }}"
+}

web/i18n/en/settings.json

@@ -103,7 +103,5 @@
     "advanced.data": "settings data",
     "advanced.reset": "reset all settings",
     "advanced.import": "import",
-    "advanced.import.no_data": "failed loading setting data from file",
-    "advanced.import.invalid": "file does not contain valid cobalt settings",
     "advanced.export": "export"
 }