Split off from https://trello.com/c/3jmb9Ucx/678-topic-titles-trimmed-to-200-characters-when-editing-bug-71584
The titles should be limited to 255 bytes (Not the current 260 bytes). Possibly there's a global variable we can share?) The text-fields should not accept more content than the character/byte limit - currently it extends infinitely, but gives warnings if we try to save with more than 260 bytes. - Compare this with a wikitext page: https://www.mediawiki.org/w/index.php?title=User_talk:Quiddity_%28WMF%29/sandbox&action=edit§ion=new
Also see https://bugzilla.wikimedia.org/show_bug.cgi?id=71584 for more
Trello card: T7lDlHsc