chore(release): 2.0.4 -- shorter description, webinterface strings out

Housekeeping only, no behaviour change.

The v2.0.0 changelog block moves out of the plugin manifest to stay
inside the four-subblock limit; it remains in docs/CHANGELOG.md.

docs/CHANGELOG.md

@@ -11,6 +11,27 @@ releases as an overview and links to the release pages for details.
 
 ---
 
+## [2.0.4] — 2026-08-20
+
+Housekeeping. Nothing changes in how the plugin behaves.
+
+### Changed
+
+- The installer description is shorter and leads with what the plugin does
+  rather than what category it belongs to: 367 characters instead of 908. Two
+  things in it were also wrong rather than merely long — it claimed 24
+  interface languages when there are 25, and `repo.json` and the plugin yaml
+  carried different one-line summaries, so the store listing and the plugin
+  details showed different sentences.
+
+### Removed
+
+- 30 translation keys belonging to the webinterface, across all 25 languages,
+  plus the generated property for each. The feature itself, its HTTP routes and
+  its frontend went out in May; only the strings were left behind. Every key was
+  matched on word boundaries against the whole repository before removal, and
+  the build proves the rest: a key still in use would have failed to compile.
+
 ## [2.0.3] — 2026-08-20
 
 ### Fixed