I think the issue is with the selected “Text and spoken language” in BattleNet’s Game Settings for Hearthstone.
If I set the app language to English (UK) the title and description are missing; switching it to English (US) makes them show up.
So, the devs should create a British English version of the text and mark it as such, as well as set it to use US English as fallback option if a British English text isn’t specified.
I’d include screenshots, but even the “Reporting a Bug” guidelines’ suggestion to put them in a blockquote or pre-formatted text refuses to save the post.