Prepare v2.19.4

Version bump, release notes, Belarusian and Slovak locales, and the rest
of the midnight-drag work (#253).

Also the fixes from reviewing this branch: EXDATE zone prefixes in the
form the provider actually writes, "only this event" on a row that does
not recur, RDATE carried through the recurrence rewrite, an exact test
for the reminder default sentinel, the widget's re-arm backstop, and the
counts a stopped import reports.

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.19.4] — 2026-09-01
+
 ### Fixed
 - **A deleted occurrence no longer comes back when the series is re-timed.**
   Delete a single occurrence of a repeating event, then change the time of the
@@ -56,6 +58,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   occurrence of a repeating event, back up, restore — and it was there again,
   because the removals never made it into the file. They travel with the series
   now, so a restored calendar looks the way you left it ([#225]).
+- **A reminder left on your account's default no longer went off as the event
+  started.** An event whose reminder says "Default" is the account's to time, not
+  Calendula's — it was reading that setting as a lead time of its own and firing a
+  minute after the event began. It now leaves such a reminder alone, and says so
+  on the event.
+- **"Only this event" on an event that doesn't repeat now edits or deletes it.**
+  Deleting used to write an exclusion onto a one-off event instead — which left
+  the event there and lost its end time — and editing filed the change away as an
+  exception to nothing, so it vanished.
+- **An import that the calendar cuts short now tells you how far it got.** Losing
+  the calendar or the permission part way through a big file reported the whole
+  import as failed, so importing again added everything twice.
+- **An event that runs past midnight can be dragged by either half.** Its second
+  half couldn't be picked up at all, and the first could only be moved later. Both
+  halves now move, and both are previewed while you hold either one, so the event
+  reads as moving rather than growing. The blocks are cut square at midnight
+  instead of rounded off, a month row draws an event crossing into the next week
+  as one bar, and a move across a daylight-saving change no longer lands an hour
+  out ([#253]).
 
 ### Added
 - **More of an imported `.ics` survives the trip**: tasks come across as events
@@ -64,6 +85,19 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   and event colours are carried over — matched to the closest colour your
   calendar's account offers, so a migrated calendar still reads at a glance
   ([#225]).
+- **Belarusian and Slovak**, both contributed as community translations through
+  [Calendula's Weblate](https://weblate.dev.jeanlucmakiola.de/projects/calendula/).
+  Belarusian covers about two thirds of the app and Slovak about a third, so
+  untranslated parts still show in English until they fill out. Pick either under
+  Settings → Language or in Android's per-app language settings. Thanks to Dmitri
+  Gabinski (Belarusian) and Julie (Slovak); help finishing them is very welcome.
+
+### Changed
+- **Arabic, Polish and Simplified Chinese are now complete**, all three carried
+  the rest of the way this cycle — Simplified Chinese from a fifth of the app to
+  all of it. Czech and Russian grew too, and still have room. Thanks to Sup99999
+  (Arabic), Bazyli Cyran (Polish), JeanWenzel (Simplified Chinese), James
+  Trivette (Czech) and SpiritOTHawk (Russian).
 
 ## [2.19.3] — 2026-08-22
 
@@ -1533,3 +1567,4 @@ automatically, with zero telemetry and no internet permission.
 [#228]: https://codeberg.org/jlmakiola/calendula/issues/228
 [#234]: https://codeberg.org/jlmakiola/calendula/issues/234
 [#248]: https://codeberg.org/jlmakiola/calendula/issues/248
+[#253]: https://codeberg.org/jlmakiola/calendula/issues/253