Fetch chat language from language_code

[group-butler]

Fetch chat language from language_code

[NotAFile]

@yangm97 well, I might have a different locale and timezone or the group owner might have a different timezone

[yangm97]

@NotAFile the timezone is not related to the locale.
for groups, you would fetch the chat timezone, for users you would fetch their timezone (and mark all of them accordingly)

one might argue this is barely better than throwing the UTC for everyone though