release: cut 0.4.0 — the first translated release

Ships the first community translations: German (98%) and Brazilian
Portuguese (100%), both from Weblate, plus the translation infrastructure
and the Codeberg forge move that had accumulated under Unreleased.

A minor bump rather than a patch: two new user-facing languages is a
feature, the way 0.3.0 was cut for Reminders.

versionCode is the derived 400 (MAJOR*10000 + MINOR*100 + PATCH), and
scripts/sync_changelog_to_fastlane.sh generated changelogs/400.txt so the
official F-Droid listing shows this version's "What's New". At 908 chars
it exceeds the script's 500-char advisory and may be truncated in-client
— consistent with past feature releases (0.2.0 ran 1811, 0.3.0 692).

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146mhMLZ5AqJSZkADDc92Jz

app/build.gradle.kts

@@ -29,8 +29,8 @@ android {
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 0.2.0 -> 200). The Gitea release is marked
         // as a pre-release while MAJOR is 0. See docs/RELEASING.md.
-        versionCode = 302
-        versionName = "0.3.2"
+        versionCode = 400
+        versionName = "0.4.0"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }