Release v2.22.3 (#362)

Patch release for #361. No app changes.

- `title.txt` in every store locale is now "Calendula: Calendar", with "Calendar" taken from the app's own translation of the word (`event_detail_calendar`). Since 2.22.0 the Play listing is pushed from the repo, and the repo title was only "Calendula", which replaced the suffixed name from the Play Console.
- ja has no translation for that string yet, so it uses カレンダー. zh-CN has "Calendula" as its translation of "Calendar" on Weblate, so the title uses 日历 instead. That string should be fixed on Weblate.
- F-Droid reads the same `title.txt`, so the F-Droid listing gets the suffix too.

Plus the release commit: CHANGELOG section, versionName 2.22.3 / versionCode 22203, and the 22203 changelogs for every store locale. Merging this to main triggers the release pipeline.

Closes #361

app/build.gradle.kts

@@ -28,8 +28,8 @@ android {
         // which builds this version and then creates the matching vX.Y.Z tag +
         // release itself (versionCode is pinned to MAJOR*10000 + MINOR*100 +
         // PATCH from versionName, e.g. 2.7.2 -> 20702). See docs/RELEASING.md.
-        versionCode = 22202
-        versionName = "2.22.2"
+        versionCode = 22203
+        versionName = "2.22.3"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }