Percent sign (%) is evaluated as a language key lookup in some contexts

The bug

In various places where text is rendered, user-supplied strings containing a % are rendered replaced with their language file translation.

How to reproduce

1. Get an item and an anvil

2. Rename the item to %store.csb.terms

3. Hold the item in your hand

4. Look at the text that appears

Expected result

The literal text %store.csb.terms should appear

Observed result

This monstrosity appears

Affected places

• Command feedback

  • How to reproduce: /kill %store.csb.terms

• Held item hotbar tooltip

  • How to reproduce: rename an item %store.csb.terms

• Scoreboard sidebar

  • How to reproduce: /scoreboard objectives add test “%store.csb.terms”

• NPC Dialogue (title and buttons, but not description)

  • How to reproduce: name an NPC %store.csb.terms

• @minecraft/server-ui dialogs

  • How to reproduce: make a pack that does it with javascript

Unaffected places

• /title title/subtitle/actionbar

• Inventory item tooltip

• Written book text

• Sign text

• Name tags

• Container interface titles

This is related to, but distinct from, MCPE-186408, since the % sign triggers the bug in this case.