refac: migration crash, real-database tests, site deleted during create, ruels out of the repo, lists

internal/domain/language/languageDomain.go

@@ -72,3 +72,19 @@ type SiteLanguage struct {
 	Enabled   bool
 	Confirmed bool
 }
+
+func DefaultOf(languages []SiteLanguage) (SiteLanguage, bool) {
+	index := slices.IndexFunc(languages, func(candidate SiteLanguage) bool { return candidate.IsDefault })
+	if index < 0 {
+		return SiteLanguage{}, false
+	}
+	return languages[index], true
+}
+
+func StartingTag(languages []SiteLanguage) string {
+	defaultLanguage, found := DefaultOf(languages)
+	if !found || !defaultLanguage.Confirmed {
+		return Unassigned
+	}
+	return defaultLanguage.Tag
+}