telegram: Fix UI and store useful Telegram info

Creation now works, and language preferences made before signup are
kept. telegram file storage now uses the Jellyfin ID as a key, which
makes much more sense. Also added radios to select preferred notification
method (email/telegram) as well, which the admin will soon be able to
change also.

lang/form/en-us.json

@@ -19,11 +19,15 @@
         "confirmationRequiredMessage": "Please check your email inbox to verify your address.",
         "yourAccountIsValidUntil": "Your account will be valid until {date}.",
         "linkTelegram": "Link Telegram",
-        "sendPIN": "Send the PIN below to the bot, then come back here to link your account."
+        "sendPIN": "Send the PIN below to the bot, then come back here to link your account.",
+        "contactEmail": "Contact through Email",
+        "contactTelegram": "Contact through Telegram"
     },
     "notifications": {
         "errorUserExists": "User already exists.",
         "errorInvalidCode": "Invalid invite code.",
+        "errorTelegramVerification": "Telegram verification required.",
+        "errorInvalidPIN": "Telegram PIN is invalid.",
         "telegramVerified": "Telegram account verified."
     },
     "validationStrings": {