Minor i18n fixes (#663)

* i18n fixes

Add PKI Backup Reminder dialog + ensure en-US is UI default

* Revert edits to i18n components

src/i18n/locales/en/common.json

@@ -54,6 +54,7 @@
       "suffix": "ms"
     },
     "second": { "one": "Second", "plural": "Seconds" },
+    "day": { "one": "Day", "plural": "Days" },
     "snr": "SNR",
     "volt": { "one": "Volt", "plural": "Volts", "suffix": "V" },
     "record": { "one": "Records", "plural": "Records" }

src/i18n/locales/en/dialog.json

@@ -93,7 +93,6 @@
     "unignoreNode": "Unignore node"
   },
   "pkiBackup": {
-    "description": "We recommend backing up your key data regularly. Would you like to back up now?",
     "loseKeysWarning": "If you lose your keys, you will need to reset your device.",
     "secureBackup": "Its important to backup your public and private keys and store your backup securely!",
     "footer": "=== END OF KEYS ===",
@@ -103,6 +102,13 @@
     "fileName": "meshtastic_keys_{{longName}}_{{shortName}}.txt",
     "title": "Backup Keys"
   },
+  "pkiBackupReminder": {
+    "description": "We recommend backing up your key data regularly. Would you like to back up now?",
+    "title": "Backup Reminder",
+    "remindLaterPrefix": "Remind me in",
+    "remindNever": "Never remind me",
+    "backupNow": "Back up now"
+  },
   "pkiRegenerate": {
     "description": "Are you sure you want to regenerate key pair?",
     "title": "Regenerate Key Pair"