Add German and Swiss German translations

[srueegger]

Summary

Adds full German (de) and Swiss German (de_CH) translations, and fixes
three pre-existing bugs that prevented localization from working at all —
even the existing Spanish translation never loaded at runtime.

What's included

Bug fixes (the reason no translation ever worked)

• src/Main.vala — gettext was never initialized. The app defined
  GETTEXT_PACKAGE and LOCALEDIR in Config.vala.in, but main() never
  called Intl.bindtextdomain() / Intl.textdomain(). Without those calls,
  gettext has no idea where to look for .mo files, so every _("…") just
  returned the English msgid.

• po/meson.build — gettext domain was set to keymaker, but the rest
  of the project (meson.project_name() in meson.build, gettext-domain
  in gschema.xml.in) uses keysmith. Result: the build produced
  keymaker.mo, but the binary asked gettext for keysmith.mo. The
  inline comment in meson.build:47 explicitly notes that these must
  match — they didn't.

• po/POTFILES.in — referenced 40+ files that no longer exist (cloud,
  diagnostics, rotation, tunnels features that were removed). Any
  meson compile keysmith-pot would fail on the first missing file.
  Now contains only paths that actually exist in the tree.

New translations

• po/de.po — complete German translation (604 strings) following
  GNOME translation guidelines:

  • Infinitive form throughout (no direct "Sie"-address)
  • German typographic quotes „…"
  • Unicode ellipsis (…) instead of three dots
  • Standard GNOME German vocabulary (Schlüssel, Sicherung, Passphrase,
    Tastenkürzel, Einstellungen, etc.)
  • Accelerator keys (_) moved to natural German letters
    (e.g. _Quit → _Beenden)
  • Plural forms filled in for both msgstr[0] and msgstr[1]

• po/de_CH.po — Swiss German variant. Derived from de.po with ß
  replaced by ss throughout (Grösse, standardmässig, routinemässig, …).

• po/LINGUAS — registers both de and de_CH so Meson builds them.

Tooling & hygiene

• scripts/run-local.sh — convenience wrapper for testing a locally
  installed build (meson install --prefix=$(pwd)/install) without
  touching the system. Sets LANG/LANGUAGE, GSETTINGS_SCHEMA_DIR
  and XDG_DATA_DIRS correctly, and accepts de, de_CH, en, or
  any other locale code as its argument. Useful for translation review.

• .gitignore — adds install/ (alongside the existing builddir/)
  so meson install --destdir=… output never gets committed.

Testing

Built with the development profile (so it doesn't collide with the
production Flatpak's D-Bus app-id) and confirmed both German and Swiss
German render correctly at runtime:

meson setup builddir --prefix="$(pwd)/install" -Dprofile=development
meson install -C builddir
./scripts/run-local.sh de       # German
./scripts/run-local.sh de_CH    # Swiss German
./scripts/run-local.sh en       # English (original)

Follow-ups (not in this PR)

• The Spanish translation (po/es.po) references stale Python paths
  (keymaker/ui/window.py) and predates the Vala rewrite. It probably
  needs a refresh against the new keysmith.pot.

Summary by CodeRabbit

• New Features

  • German and Swiss German language translations are now available, providing full localization of application menus, dialogs, notifications, and user interface text.

• Chores

  • Updated translation infrastructure and build configuration; integrated internationalization initialization and added development utilities for local testing.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 6d5f261d-710a-4817-9164-0023902b2ed3

📥 Commits

Reviewing files that changed from the base of the PR and between f7965e8 and e327d8d.

📒 Files selected for processing (1)

• scripts/run-local.sh

📝 Walkthrough

Walkthrough

This PR adds internationalization (i18n) support to the Keymaker application with German and Swiss German translations. The application is updated to initialize locale settings at startup, build configuration is modified to identify the translation textdomain and register available language locales, two complete translation files are provided, and local development tooling is added to test translations without system installation.

Changes

Internationalization and Translations

Layer / File(s)	Summary
I18n initialization and build configuration src/Main.vala, po/meson.build, po/LINGUAS, po/POTFILES.in	Application startup now calls Intl.setlocale, Intl.bindtextdomain, Intl.bind_textdomain_codeset, and Intl.textdomain before creating the application. Build configuration updates the gettext identifier from keymaker to keysmith, registers de and de_CH language locales in LINGUAS, and updates POTFILES.in to specify the exact source files whose strings are extracted for translation.
German translation strings po/de.po	Complete German translation file with msgid/msgstr entries covering application metadata, GSettings schema descriptions, window and menu labels, SSH key management workflows, backup and recovery operations, preferences, terminal options, host configuration UI, and all user-facing dialogs, confirmations, error messages, and status notifications.
Swiss German translation strings po/de_CH.po	Complete Swiss German translation file providing equivalent msgstr translations for all application text, including proper plural forms for counts and the translator credits entry.
Local development tooling scripts/run-local.sh, .gitignore	New bash script sets up environment variables and runs the locally-installed keymaker binary from the install/ directory with optional locale configuration; .gitignore updated to exclude the local install artifacts.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A Rabbit's I18n Song

With German and Swiss tongues now aligned,
Locales are bound and strings extracted refined,
The rabbit hops through translation files complete,
Where textdomain and startup together greet! 🌍✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Add German and Swiss German translations' directly describes the main change: adding two complete translation files (de.po and de_CH.po) and supporting infrastructure.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@scripts/run-local.sh`:
- Around line 21-33: The script currently treats LANG_ARG as control input but
then forwards it to the app via exec "$PREFIX/bin/keymaker" "$@", so locale
selectors leak into the app argv; update the script to consume the locale
selector before exec by removing the first positional argument (use shift after
setting LANG_ARG or pass the arguments starting at $2 when calling keymaker) so
that LANG_ARG is not passed to keymaker; reference symbols to change: LANG_ARG,
the case ... esac block, and the exec "$PREFIX/bin/keymaker" "$@" invocation.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3df8f22b-84c9-437e-87e8-a48f842ef8ee

📥 Commits

Reviewing files that changed from the base of the PR and between 3a60d81 and f7965e8.

📒 Files selected for processing (8)

• .gitignore
• po/LINGUAS
• po/POTFILES.in
• po/de.po
• po/de_CH.po
• po/meson.build
• scripts/run-local.sh
• src/Main.vala