Add optional KYC flow and service-backed account limits

frontend/app/lib/kyc/copy.dart

@@ -0,0 +1,37 @@
+import 'package:sxchnge_kyc/sxchnge_kyc.dart';
+
+import '../generated/i18n/app_localizations.dart';
+
+String statusTitle(AppLocalizations l, IdentityStatus s) => switch (s) {
+  IdentityStatus.unverified => l.kycUnverified,
+  IdentityStatus.pending => l.kycPending,
+  IdentityStatus.approved => l.kycApproved,
+  IdentityStatus.changesRequested => l.kycChanges,
+  IdentityStatus.denied => l.kycDenied,
+};
+String statusBody(AppLocalizations l, IdentityStatus s) => switch (s) {
+  IdentityStatus.unverified => l.kycUnverifiedBody,
+  IdentityStatus.pending => l.kycPendingBody,
+  IdentityStatus.approved => l.kycApprovedBody,
+  IdentityStatus.changesRequested => l.kycChangesBody,
+  IdentityStatus.denied => l.kycDeniedBody,
+};
+String reasonText(AppLocalizations l, ReviewReason r) => switch (r) {
+  ReviewReason.passportUnreadable => l.kycPassportReason,
+  ReviewReason.selfieUnreadable => l.kycSelfieReason,
+  ReviewReason.passportExpired => l.kycExpiredReason,
+  ReviewReason.unableToVerify => l.kycDeniedReason,
+};
+String errorText(AppLocalizations l, KycError e) => switch (e) {
+  KycError.unavailable => l.kycErrorUnavailable,
+  KycError.internal => l.kycErrorInternal,
+  KycError.permission => l.kycErrorPermission,
+  KycError.format => l.kycErrorFormat,
+  KycError.tooLarge => l.kycErrorLarge,
+  KycError.unreadable => l.kycErrorUnreadable,
+  KycError.tooSmall => l.kycErrorSmall,
+  KycError.incomplete => l.kycErrorIncomplete,
+  KycError.sessionExpired => l.kycErrorSession,
+  KycError.rateLimited => l.kycErrorRate,
+  KycError.conflict => l.kycErrorConflict,
+};