Download translations on demand instead of bundling them

Locales are fetched from the Iris repository at runtime into
languages/downloaded and cached against the revision the jar was built
from; the artifact ships only a manifest of the available locales.
IrisLanguage gains a player language service, per-audience snapshots and
an in-game message editor that writes locale overrides. The Bukkit
artifact verifier now fails when any locale file is embedded, and the
modded shadow jars drop the Bukkit-only switcher and editor classes.

adapters/neoforge/build.gradle

@@ -228,6 +228,9 @@ tasks.named('shadowJar', ShadowJar).configure {
     // archive as versioned and re-scan it per release directory for nothing.
     exclude('META-INF/versions/**')
     addMultiReleaseAttribute.set(false)
+    exclude('art/arcane/volmlib/util/localization/BukkitLanguageSwitcher*.class')
+    exclude('art/arcane/volmlib/util/localization/BukkitLanguageEditor*.class')
+    exclude('art/arcane/volmlib/util/localization/BukkitVolmitCommand*.class')
     // Invalid package name on Java 9+ ('enum' is a keyword); a module-path scan chokes on it.
     exclude('org/apache/commons/lang/enum/**')
     // Compile-only annotation carriers. Shipping them duplicates packages other mods also ship.