Stage 5: das-update and das-welcome (0.3.0)

das-tools (Go, GTK 3 via gotk3):
- das-update: update window, tray icon when updates are available,
  --cli mode; xbps-install -Su between a snapper pre/post snapshot pair,
  privileged part through pkexec, rollback and reboot hints
- das-welcome: first-login window with install (live), language,
  home folder renaming, updates, settings and help

das-settings 0.3.0: create home folders with translated names.
xdg-user-dirs 0.20 only looks for translations in the first
XDG_DATA_DIRS entry with a locale directory (/usr/local/share/locale).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

srcpkgs/das-tools/files/src/cmd/das-welcome/language_test.go

@@ -0,0 +1,29 @@
+package main
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParseLocales(t *testing.T) {
+	got := parseLocales("C\nC.utf8\nPOSIX\nuk_UA.utf8\nen_US.UTF-8\nde_DE.iso88591\n")
+	want := []string{"en_US.UTF-8", "uk_UA.UTF-8"}
+	if !reflect.DeepEqual(got, want) {
+		t.Errorf("parseLocales = %q, want %q", got, want)
+	}
+}
+
+func TestSetDmrcLanguage(t *testing.T) {
+	tests := []struct{ in, want string }{
+		{"", "[Desktop]\nLanguage=en_US.UTF-8\n"},
+		{"[Desktop]\nSession=xfce\n", "[Desktop]\nSession=xfce\nLanguage=en_US.UTF-8\n"},
+		{"[Desktop]\nLanguage=uk_UA.UTF-8\nSession=xfce\n", "[Desktop]\nLanguage=en_US.UTF-8\nSession=xfce\n"},
+		{"[Desktop]\nSession=xfce\n[Other]\nLanguage=x\n", "[Desktop]\nSession=xfce\nLanguage=en_US.UTF-8\n[Other]\nLanguage=x\n"},
+		{"[Other]\nKey=1\n", "[Other]\nKey=1\n[Desktop]\nLanguage=en_US.UTF-8\n"},
+	}
+	for _, tt := range tests {
+		if got := setDmrcLanguage(tt.in, "en_US.UTF-8"); got != tt.want {
+			t.Errorf("setDmrcLanguage(%q) =\n%q\nwant\n%q", tt.in, got, tt.want)
+		}
+	}
+}