docs(manifest): shorter plugin description, and one that leads with the point

The installer text ran 908 characters and opened by naming a category
rather than saying what the plugin does. It now says it in the first
sentence and stops at 367.

Two things were also wrong rather than long: it claimed 24 locales when
there are 25, and the punchline in repo.json did not match the one in
the yaml, so the store listing and the plugin details showed different
sentences.

Attribution is unaffected -- it lives in NOTICE.md, README.md and the
licence, which is where the notices belong. This field is a product
description.

HellionChat/HellionChat.yaml

@@ -1,25 +1,11 @@
 name: Hellion Chat
 author: Jon Kazama (Hellion Forge)
-punchline: A Hellion Forge plugin — privacy-focused chat replacement for FFXIV, built for EU, US and JP data rules.
+punchline: Chat replacement for FFXIV that keeps your conversations and forgets the rest.
 description: |-
-    Chat replacement for FINAL FANTASY XIV with privacy controls built around
-    EU, US and JP data-protection rules.
+    A chat window that stores your own conversations and nothing else. Public chat, NPC dialogue, system messages and battle logs stay out of the database until you switch them on.
 
-    By default only your own conversations are stored. Public chat, NPC
-    dialogue and system messages stay out of the database unless you opt in.
-    Retention windows are configurable per channel, history can be wiped
-    retroactively, and everything can be exported on demand.
+    Retention per channel, retroactive wipe, export to Markdown, JSON or CSV. Setup wizard with four profiles. 25 languages. Its own config and database.
 
-    Features:
-    - Channel whitelist with a Privacy-First default
-    - Per-channel retention with a daily background sweep
-    - Retroactive cleanup (Ctrl+Shift confirm)
-    - Export to Markdown, JSON or CSV
-    - First-run wizard with four preset profiles
-    - Multi-language UI (24 locales) with live language switching
-    - Own config and database — no shared state with other plugins
-
-    Based on Chat 2 by Infi and Anna (EUPL-1.2).
     Support: https://discord.gg/X9V7Kcv5gR
 repo_url: https://gitea.hellion-forge.cloud/JonKazama-Hellion/HellionChat
 accepts_feedback: true