diff -r 6d1bf321fb89 -r 2f2b2152580f i18n/mki18n.py
--- a/i18n/mki18n.py	Thu Oct 11 12:09:04 2018 +0300
+++ b/i18n/mki18n.py	Fri Oct 12 10:42:47 2018 +0300
@@ -84,8 +84,10 @@
 import os
 import sys
 import re
+from builtins import str as text
 import wx
 
+
 # -----------------------------------------------------------------------------
 # Global variables
 # ----------------
@@ -200,7 +202,7 @@
     os.chdir(applicationDirectoryPath)
     filelist = 'app.fil'
     if not os.path.exists(filelist):
-        raise IOError(2, 'No module file: ' % filelist)
+        raise IOError(2, 'No module file: %s' % filelist)
 
     fileout = 'messages.pot'
     # Steps:
@@ -487,7 +489,7 @@
     try:
         optionList, pargs = getopt.getopt(sys.argv[1:], validOptions, validLongOptions)
     except getopt.GetoptError as e:
-        printUsage(e[0])
+        printUsage(e)
         sys.exit(1)
     for (opt, val) in optionList:
         if opt == '-h':
@@ -513,7 +515,7 @@
             makePO(appDirPath, option['domain'], option['verbose'])
             exit_code = 0
         except IOError as e:
-            printUsage(e[1] + '\n   You must write a file app.fil that contains the list of all files to parse.')
+            printUsage(text(e) + '\n   You must write a file app.fil that contains the list of all files to parse.')
     if option['mo']:
         makeMO(appDirPath, option['moTarget'], option['domain'], option['verbose'], option['forceEnglish'])
         exit_code = 0