Fix use of deprecated flask.ext imports

 flask.ext has been deprecated for years now and has been logging
 a warning to console ever since. OctoPrint 1.4.1 had to update
 the flask dependencies due to security considerations and with the
 new flask version the old compatibility layer still allowing
 flask.ext to work got removed.

 See also the discussion in OctoPrint/OctoPrint#3638

 Closes #269

Author: foosel

octoprint_telegram/__init__.py

@@ -3,8 +3,8 @@
 from subprocess import Popen, PIPE
 import threading, requests, re, time, datetime, StringIO, json, random, logging, traceback, io, collections, os, flask,base64,PIL, pkg_resources,subprocess,zipfile,glob #,resource
 import octoprint.plugin, octoprint.util, octoprint.filemanager
-from flask.ext.babel import gettext
-from flask.ext.login import current_user
+from flask_babel import gettext
+from flask_login import current_user
 from .telegramCommands import TCMD # telegramCommands.
 from .telegramNotifications import TMSG # telegramNotifications
 from .telegramNotifications import telegramMsgDict # dict of known notification messages

octoprint_telegram/telegramCommands.py

@@ -2,7 +2,7 @@
 import logging, sarge, hashlib, datetime, time, operator, socket
 import octoprint.filemanager
 import requests
-from flask.ext.babel import gettext
+from flask_babel import gettext
 from .telegramNotifications import telegramMsgDict
 
 ################################################################################################################

octoprint_telegram/telegramNotifications.py

@@ -1,7 +1,7 @@
 from __future__ import absolute_import
 import time, datetime, logging
 import octoprint.util
-from flask.ext.babel import gettext
+from flask_babel import gettext
 
 ###################################################################################################
 # Here you find the known notification messages and their handles.