feat: add full Zonemaster stack with Docker and Spanish UI

- Clone all 5 Zonemaster component repos (LDNS, Engine, CLI, Backend, GUI)
- Dockerfile.backend: 8-stage multi-stage build LDNS→Engine→CLI→Backend
- Dockerfile.gui: Astro static build served via nginx
- docker-compose.yml: backend (internal) + frontend (port 5353)
- nginx.conf: root redirects to /es/, /api/ proxied to backend
- zonemaster-gui/config.ts: defaultLanguage set to 'es' (Spanish)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

zonemaster-backend/share/da.po

@@ -0,0 +1,89 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: 1.0.0\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2023-05-26 14:36+0000\n"
+"PO-Revision-Date: 2023-05-26 14:33+0000\n"
+"Last-Translator: haarbo@dk-hostmaster.dk\n"
+"Language-Team: Zonemaster project\n"
+"Language: da\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+msgid "Invalid method parameter(s)."
+msgstr "Invalid metodeparametre"
+
+msgid "Missing property"
+msgstr "Manglende egenskab"
+
+msgid ""
+"Warning: Zonemaster::LDNS not compiled with IDN support, cannot handle non-"
+"ASCII names correctly."
+msgstr ""
+"Advarsel: Zonemaster::LDNS ikke kompileret med IDN-support, og kan derfor "
+"ikke håndtere ikke-ascii-navne korrekt"
+
+#. BACKEND_TEST_AGENT:TEST_DIED
+msgid "An error occured and Zonemaster could not start or finish the test."
+msgstr ""
+"Der opstod en fejl, og Zonemaster kunne ikke starte eller afslutte testen."
+
+#. BACKEND_TEST_AGENT:UNABLE_TO_FINISH_TEST
+#, perl-brace-format
+msgid ""
+"The test took too long to run (the current limit is {max_execution_time} "
+"seconds). Maybe there are too many name servers or the name servers are "
+"either unreachable or not responsive enough."
+msgstr ""
+"Testen tog for lang tid at afvikle (den aktuelle grænse er "
+"{max_execution_time} sekunder). Måske er der for mange navneservere, eller "
+"også er navneserverne enten ikke tilgængelige eller ikke responsive nok."
+
+msgid "Invalid digest format"
+msgstr "Invalid digest-format"
+
+msgid "Algorithm must be a positive integer"
+msgstr "Algoritmen skal være et positivt heltal"
+
+msgid "Digest type must be a positive integer"
+msgstr "Digest type skal være et positivt heltal"
+
+msgid "Keytag must be a positive integer"
+msgstr "Keytag skal være et positivt heltal"
+
+msgid "Domain name required"
+msgstr "Domænenavn påkrævet"
+
+msgid "The domain name is IDNA invalid"
+msgstr "Domænenavnet er IDNA ugyldigt"
+
+msgid ""
+"The domain name contains non-ascii characters and IDNA support is not "
+"installed"
+msgstr ""
+"Domænenavnet indeholder ikke-ascii-tegn og IDNA-support er ikke installeret"
+
+msgid "The domain name character(s) are not supported"
+msgstr "Domænenavnets tegn er ikke understøttet"
+
+msgid "The domain name contains consecutive dots"
+msgstr "Domænenavnet indeholder flere dots (.) efter hinanden"
+
+msgid "The domain name or label is too long"
+msgstr "Domænenavnet eller labelen er for lang"
+
+msgid "Invalid language tag format"
+msgstr "Invalidt sprogkode-format"
+
+msgid "Unkown language string"
+msgstr "Ukendt sprogstreng"
+
+msgid "Invalid IP address"
+msgstr "Invalid IP-adresse"
+
+msgid "Invalid profile format"
+msgstr "Invalidt profil-format"
+
+msgid "Unknown profile"
+msgstr "Ukendt profil"