Fix the broken README screenshot and spell out the install channels (#97)

The screenshot strip linked `05-edit.png`, which doesn't exist — replaced with the real agenda screenshot, and the unused day-view shot is now shown too (six screenshots, all present).

Install is now one section per channel — official F-Droid, self-hosted F-Droid repo, Codeberg release / Obtainium, Google Play (coming soon), build from source — with an overview table up front and the previously missing "Get it on Obtainium" badge in the header. The badge links to the Codeberg releases page rather than an `obtainium://` deep link, because Forgejo's markdown sanitiser strips custom URL schemes.

The Play section notes that Play builds carry Google's signing key (so switching channels needs an uninstall) and asks for closed-testing testers.

Also corrects two stale claims: the UI is no longer German-and-English only (nine translations exist), and the language list now says so.

No issue — reported directly.

Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de>
Reviewed-on: https://codeberg.org/jlmakiola/calendula/pulls/97

README.md

@@ -18,15 +18,18 @@ Reads, writes, and reminds — on top of the system calendar, with zero network
 <p>
 <a href="https://f-droid.org/packages/de.jeanlucmakiola.calendula/"><img src="https://fdroid.gitlab.io/artwork/badge/get-it-on.png" alt="Get it on F-Droid" height="56"></a>
 &nbsp;
+<a href="https://codeberg.org/jlmakiola/calendula/releases"><img src="https://github.com/ImranR98/Obtainium/blob/main/assets/graphics/badge_obtainium.png?raw=true" alt="Get it on Obtainium" height="56"></a>
+&nbsp;
 <a href="https://ko-fi.com/jeanlucmakiola"><img src="https://storage.ko-fi.com/cdn/brandasset/v2/support_me_on_kofi_badge_beige.png" alt="Support me on Ko-fi" height="56"></a>
 </p>
 
 <p>
-<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/01-week.png" width="19%" alt="Week view">&nbsp;
-<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/02-month.png" width="19%" alt="Month view">&nbsp;
-<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/04-detail.png" width="19%" alt="Event detail">&nbsp;
-<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/05-edit.png" width="19%" alt="Event form">&nbsp;
-<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/06-onboarding.png" width="19%" alt="Reminder onboarding">
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/01-week.png" width="16%" alt="Week view">&nbsp;
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/02-month.png" width="16%" alt="Month view">&nbsp;
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/03-day.png" width="16%" alt="Day view">&nbsp;
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/04-detail.png" width="16%" alt="Event detail">&nbsp;
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/05-agenda.png" width="16%" alt="Agenda view">&nbsp;
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/06-onboarding.png" width="16%" alt="Reminder onboarding">
 </p>
 
 </div>
@@ -68,24 +71,38 @@ database, no sync stack reinvented.
 
 - Real Material 3 Expressive throughout — dynamic color (Android 12+),
   expressive motion and shapes, light/dark theme
-- German and English UI, per-app language setting — and [open to community
-  translations](#-translations)
+- English and German UI plus community translations (Spanish, French, Italian,
+  Polish, and more in progress), per-app language setting — and [open to more
+  languages](#-translations)
 - **Zero telemetry, zero analytics, no internet permission** — your data
   never leaves the device
 
 ## 📦 Install
 
+Pick whichever channel you already use — they all install the same app:
+
+| Channel | Updates | Notes |
+| --- | --- | --- |
+| [Official F-Droid](#f-droid-recommended) | On F-Droid's build schedule | Recommended; no extra setup |
+| [Self-hosted F-Droid repo](#self-hosted-f-droid-repo-fastest-updates) | Minutes after a release | Fastest; needs the repo added once |
+| [Codeberg release / Obtainium](#codeberg-release--obtainium) | Per release | Plain APK download, or automated by Obtainium |
+| [Google Play](#google-play-coming-soon) | — | Coming soon |
+| [Build from source](#build-from-source) | Whenever you build | Full control |
+
 ### F-Droid (recommended)
 
 Calendula is on the **official [F-Droid](https://f-droid.org) repository** —
 just search for **Calendula** in any F-Droid client, or
 [install it from f-droid.org](https://f-droid.org/packages/de.jeanlucmakiola.calendula/).
 
-### Self-hosted repo (latest builds)
+F-Droid rebuilds from source on its own schedule, so a new version usually
+shows up there a few days after release.
 
-New versions are built, signed, and published to a self-hosted repository the
-moment each tag lands — usually a few days ahead of the official repo, which
-rebuilds on F-Droid's own schedule. Add it for the freshest builds:
+### Self-hosted F-Droid repo (fastest updates)
+
+Every release is built, signed, and published to a self-hosted F-Droid
+repository as part of the release pipeline, so it lands there first. Add it once
+and your F-Droid client handles updates from then on:
 
 1. In your F-Droid client, open *Settings → Repositories → Add* (or open the
    link below on your phone):
@@ -100,8 +117,43 @@ rebuilds on F-Droid's own schedule. Add it for the freshest builds:
 
 2. Refresh, search for **Calendula**, install.
 
-Both channels share the same signing key, so you can switch between them
-without reinstalling. Or build from source — see below.
+### Codeberg release / Obtainium
+
+If you'd rather not use F-Droid at all, every release is also published on
+**[Codeberg](https://codeberg.org/jlmakiola/calendula/releases)** with the
+signed APK (`calendula_vX.Y.Z.apk`) and a `.sha256` checksum attached — download
+and install it directly.
+
+For automatic updates from that channel, use
+**[Obtainium](https://github.com/ImranR98/Obtainium)**: *Add App* → paste
+
+```
+https://codeberg.org/jlmakiola/calendula
+```
+
+→ *Add*. Obtainium tracks the releases and prompts you when a new one appears.
+
+### Google Play (coming soon)
+
+Calendula is on its way to Google Play as an additional channel. It isn't live
+yet — this section gets a link once it is. Play builds will be signed with
+Google's key rather than mine, so switching between Play and any other channel
+will require an uninstall.
+
+> **Testers wanted.** Play requires a round of closed testing before the app can
+> go public, and I'm still looking for testers. If you'd like to help, email
+> **[business@jeanlucmakiola.de](mailto:business@jeanlucmakiola.de)** with the
+> Google account address you want to use — that address is what I need to add you
+> to the closed test.
+
+### Build from source
+
+The build is a plain Gradle build with no proprietary dependencies — see
+**[docs/BUILDING.md](docs/BUILDING.md)** (note the `floret-kit` submodule).
+
+<sub>Official F-Droid, the self-hosted repo, and the Codeberg releases all share
+the same signing key, so you can switch freely between them without
+reinstalling.</sub>
 
 ## 📚 Documentation
 
@@ -127,8 +179,11 @@ rules a change is reviewed against.
 
 ## 🌍 Translations
 
-Calendula ships in German and English, and you're warmly invited to add your
-language. Translations are managed on a self-hosted **Weblate**:
+Calendula ships in English and German, with community translations in Arabic,
+Chinese, French, Italian, Polish, Portuguese, Russian, and Spanish at varying
+degrees of completeness — partial is fine, untranslated strings simply fall back
+to English. You're warmly invited to add or finish your language. Translations
+are managed on a self-hosted **Weblate**:
 
 **→ [Help translate Calendula](https://weblate.dev.jeanlucmakiola.de/engage/calendula/)**