crimson vigil
I noticed your modpack includes a specific set of localizations. You might be interested in my mod-it lets you hide unwanted languages from the in-game language selection menu and keep only the ones you actually need.
On CurseForge and Modrinth, the mod is listed as Language Whitelist. The author is Riabov.
slender adder
I wouldn’t want to do that at pack level… I’m sure there’s plenty of players with enough English to play the pack, but also still prefer at least all the vanilla stuff in their native language.
Also, mods include their own varying sets of localizations.