Added Kannada Template:welcome in welcome.py
Added Kannada Template:welcome in welcome.py

Bug: T216871
Change-Id: I3ff6ddb26c7e7a23e72c6e66aca89d8f2ed72dae

wikimedia/pywikibot-core,PersianWikipedia/pywikibot-core,wikimedia/pywikibot-core