Same request as for Toy Box Enhanced. 😉

That's probably going to take a bit longer. MJE has more features than TBE and therefore also more APIs in use, which don't work in classic. :(

Thank you for this first version, which allowed me to work on the translation.

The "Type" and "Faction" filters work well. With the "Expansion" filter, the name Dragonflight does not appear (unimportant to WotLK, just cosmetic) — but maybe only the names of the first three expansions should appear, like for Toy Box Enhanced.

The "Family" filter works well, except when "Hidden by the game" is checked: 11 mounts appear even when everything is unchecked.

For "Sources", 7 mounts appear when everything is unchecked, and many more when "Hidden by the game" is checked. The names of the 8th, 9th and 15th source don't appear.

I tested the latest version: the Avatar of Flame — from the Cataclysm Classic Heroic Edition — is not classified in the Family section, and also (but hidden by the game), Hao-Yue, River Foreseer.

As you might have noticed some features are missing in the classic version. It's mostly because of technical limits of the classic client. I do hope that Blizz fixes most of it with Cata Classic.