artificial ASCII restrictions

There is an artificial restriction preventing the use of non-ASCII (Unicode) characters in identifiers such as team names, item IDs, tag names, and similar internal references. This limitation exists despite Minecraft's full technical ability to render and handle Unicode characters correctly.

Steps to Reproduce:

Option1:

In a mod, define a custom item ID using non-ASCII characters (e.g., modid:größe_item or modid:日光).

Option2:

Define a new texture or playsound in a resource pack with non-ASCII characters

Expected Behavior:
Unicode characters should be allowed in identifiers like item IDs, Playsound names etc.. Minecraft already supports full Unicode for in-game text, including chat, books, UI elements, and display names.

Actual Behavior:
Non-ASCII characters (e.g., ä, ß, č, 日) are either rejected outright or cause an error when used in commands or internal identifiers. For example:

Affected Versions:
All versions of Minecraft Java Edition
(Vanilla, unmodified—no OptiFine or third-party tools)

Additional Notes:

• This restriction appears to be arbitrary and not technically necessary.

• It negatively impacts international players and content creators, especially in non-English-speaking communities.

• Allowing Unicode in identifiers would improve accessibility, localization, and creativity.