How to force tags to contain only small letters?

edit

thanks! it works, but it does not change the old big-letter tags

Maybe you could try writing a management command lowercase_tags based on rename_tags_id command and make a pull request on github?

@Evgeny I would, but I'm not good enough..

@Evgeny This settings page is not working on my server. Is there any other possibility to set force lower-case tags?

@bluebyte is that on our hosted site or your own? If you are hosting the site yourself - then please set up shared cache properly (with redis or memcached) then the settings will work.