diff --git a/frontend/src/i18n/index.ts b/frontend/src/i18n/index.ts
index 719b0e5f..619e3268 100644
--- a/frontend/src/i18n/index.ts
+++ b/frontend/src/i18n/index.ts
@@ -30,6 +30,38 @@ import enSeo3 from "./locales/en/seo3.json";
 import enSeo4 from "./locales/en/seo4.json";
 import { DEFAULT_LOCALE, LOCALES, type Locale } from "./config";
 
+/**
+ * Deep merge for locale resource files. The namespace used to be built
+ * with a SHALLOW spread, so a top-level section present in two files had
+ * the later file silently clobber the earlier one wholesale: common2's
+ * `editor` erased common.json's `editor.share.*` (the Share modal's
+ * visibility labels rendered as raw keys), and the same collision on
+ * `header` later wiped `header.auth.*` — the account menu showed
+ * "header.auth.signOut". Merging by key ends the failure class.
+ */
+function deepMerge(
+  base: Record<string, unknown>,
+  extra: Record<string, unknown>,
+): Record<string, unknown> {
+  const out: Record<string, unknown> = { ...base };
+  for (const [k, v] of Object.entries(extra)) {
+    const prev = out[k];
+    if (
+      prev && v &&
+      typeof prev === "object" && typeof v === "object" &&
+      !Array.isArray(prev) && !Array.isArray(v)
+    ) {
+      out[k] = deepMerge(
+        prev as Record<string, unknown>,
+        v as Record<string, unknown>,
+      );
+    } else {
+      out[k] = v;
+    }
+  }
+  return out;
+}
+
 const NAMESPACES = ["common"] as const;
 type Namespace = (typeof NAMESPACES)[number];
 
@@ -47,9 +79,7 @@ void i18n
     resources: {
       en: {
         common: {
-          ...enCommon,
-          ...enCommon2,
-          ...enReleases,
+          ...deepMerge(deepMerge(enCommon, enCommon2), enReleases),
           seo: {
             ...enSeo.seo,
             ...enSeo2.seo,
@@ -131,9 +161,10 @@ export async function loadLocale(locale: Locale): Promise<void> {
     ...((seo4Mod.default ?? seo4Mod).seo ?? {}),
   };
   const merged = {
-    ...(commonMod.default ?? commonMod),
-    ...(common2Mod.default ?? common2Mod),
-    ...(releasesMod.default ?? releasesMod),
+    ...deepMerge(
+      deepMerge(commonMod.default ?? commonMod, common2Mod.default ?? common2Mod),
+      releasesMod.default ?? releasesMod,
+    ),
     seo: seoBody,
     docs: { ...docs1Body, ...docs2Body },
   };
diff --git a/frontend/src/i18n/locales/de/common.json b/frontend/src/i18n/locales/de/common.json
index 88e4aa86..a1d84208 100644
--- a/frontend/src/i18n/locales/de/common.json
+++ b/frontend/src/i18n/locales/de/common.json
@@ -23,7 +23,8 @@
       "signOut": "Abmelden"
     },
     "language": "Sprache",
-    "search": "Suche"
+    "search": "Suche",
+    "shareProject": "Projekt teilen"
   },
   "footer": {
     "about": "Velxio ist ein kostenloser, quelloffener Schaltkreis- und Mikrocontroller-Simulator, der vollständig in Ihrem Browser läuft. Arduino, ESP32, RP2040 und ATtiny85, mit SPICE-genauer analoger Co-Simulation. Entwickelt für Maker, Studenten und Embedded-Ingenieure, die durch praktisches Lernen lernen. AGPLv3."
diff --git a/frontend/src/i18n/locales/de/common2.json b/frontend/src/i18n/locales/de/common2.json
index 8560cb9e..88f9f771 100644
--- a/frontend/src/i18n/locales/de/common2.json
+++ b/frontend/src/i18n/locales/de/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "Keine Anmeldung erforderlich. Läuft zu 100 % in Ihrem Browser. Kostenlos und Open Source.",
       "openEditor": "Editor öffnen"
     }
-  },
-  "header": {
-    "shareProject": "Projekt teilen"
   }
 }
diff --git a/frontend/src/i18n/locales/en/common.json b/frontend/src/i18n/locales/en/common.json
index 2740317f..70dad49f 100644
--- a/frontend/src/i18n/locales/en/common.json
+++ b/frontend/src/i18n/locales/en/common.json
@@ -23,7 +23,8 @@
       "signOut": "Sign out"
     },
     "language": "Language",
-    "search": "Search"
+    "search": "Search",
+    "shareProject": "Share project"
   },
   "footer": {
     "about": "Velxio is a free, open-source circuit and microcontroller simulator that runs entirely in your browser. Arduino, ESP32, RP2040 and ATtiny85, with SPICE-accurate analog co-simulation. Built for makers, students and embedded engineers learning by doing. AGPLv3."
diff --git a/frontend/src/i18n/locales/en/common2.json b/frontend/src/i18n/locales/en/common2.json
index c90d4651..13d795c5 100644
--- a/frontend/src/i18n/locales/en/common2.json
+++ b/frontend/src/i18n/locales/en/common2.json
@@ -465,8 +465,5 @@
       "subtitle": "No signup required. Runs 100% in your browser. Free and open source.",
       "openEditor": "Open Editor"
     }
-  },
-  "header": {
-    "shareProject": "Share project"
   }
 }
diff --git a/frontend/src/i18n/locales/es/common.json b/frontend/src/i18n/locales/es/common.json
index 5e083391..bb549e4b 100644
--- a/frontend/src/i18n/locales/es/common.json
+++ b/frontend/src/i18n/locales/es/common.json
@@ -23,7 +23,8 @@
       "signOut": "Cerrar sesión"
     },
     "language": "Idioma",
-    "search": "Buscar"
+    "search": "Buscar",
+    "shareProject": "Compartir proyecto"
   },
   "footer": {
     "about": "Velxio es un simulador gratuito y de código abierto de circuitos y microcontroladores que funciona completamente en tu navegador. Arduino, ESP32, RP2040 y ATtiny85, con co-simulación analógica precisa con SPICE. Creado para makers, estudiantes e ingenieros de sistemas embebidos que aprenden haciendo. AGPLv3."
diff --git a/frontend/src/i18n/locales/es/common2.json b/frontend/src/i18n/locales/es/common2.json
index a8f1f457..3c2b48d7 100644
--- a/frontend/src/i18n/locales/es/common2.json
+++ b/frontend/src/i18n/locales/es/common2.json
@@ -465,8 +465,5 @@
       "subtitle": "No requiere registro. Funciona 100% en tu navegador. Gratuito y de código abierto.",
       "openEditor": "Abrir editor"
     }
-  },
-  "header": {
-    "shareProject": "Compartir proyecto"
   }
 }
diff --git a/frontend/src/i18n/locales/fr/common.json b/frontend/src/i18n/locales/fr/common.json
index 3f00595f..4d6ea222 100644
--- a/frontend/src/i18n/locales/fr/common.json
+++ b/frontend/src/i18n/locales/fr/common.json
@@ -23,7 +23,8 @@
       "signOut": "Déconnexion"
     },
     "language": "Langue",
-    "search": "Rechercher"
+    "search": "Rechercher",
+    "shareProject": "Partager le projet"
   },
   "footer": {
     "about": "Velxio est un simulateur de circuits et microcontrôleurs gratuit et open-source qui fonctionne entièrement dans votre navigateur. Arduino, ESP32, RP2040 et ATtiny85, avec co-simulation analogique précise SPICE. Conçu pour les makers, étudiants et ingénieurs embarqués qui apprennent en pratiquant. AGPLv3."
diff --git a/frontend/src/i18n/locales/fr/common2.json b/frontend/src/i18n/locales/fr/common2.json
index 46544a18..93a266e9 100644
--- a/frontend/src/i18n/locales/fr/common2.json
+++ b/frontend/src/i18n/locales/fr/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "Aucune inscription requise. Fonctionne à 100 % dans votre navigateur. Gratuit et open source.",
       "openEditor": "Ouvrir l'éditeur"
     }
-  },
-  "header": {
-    "shareProject": "Partager le projet"
   }
 }
diff --git a/frontend/src/i18n/locales/it/common.json b/frontend/src/i18n/locales/it/common.json
index 4b37eb40..85519adf 100644
--- a/frontend/src/i18n/locales/it/common.json
+++ b/frontend/src/i18n/locales/it/common.json
@@ -23,7 +23,8 @@
       "signOut": "Esci"
     },
     "language": "Lingua",
-    "search": "Cerca"
+    "search": "Cerca",
+    "shareProject": "Condividi progetto"
   },
   "footer": {
     "about": "Velxio è un simulatore gratuito e open-source di circuiti e microcontrollori che funziona interamente nel tuo browser. Arduino, ESP32, RP2040 e ATtiny85, con co-simulazione analogica SPICE accurata. Creato per maker, studenti e ingegneri embedded che imparano facendo. AGPLv3."
diff --git a/frontend/src/i18n/locales/it/common2.json b/frontend/src/i18n/locales/it/common2.json
index f4a4e1f3..f6fe7465 100644
--- a/frontend/src/i18n/locales/it/common2.json
+++ b/frontend/src/i18n/locales/it/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "Nessuna registrazione richiesta. Funziona al 100% nel tuo browser. Gratuito e open source.",
       "openEditor": "Apri Editor"
     }
-  },
-  "header": {
-    "shareProject": "Condividi progetto"
   }
 }
diff --git a/frontend/src/i18n/locales/ja/common.json b/frontend/src/i18n/locales/ja/common.json
index 6a513e48..9fb40312 100644
--- a/frontend/src/i18n/locales/ja/common.json
+++ b/frontend/src/i18n/locales/ja/common.json
@@ -23,7 +23,8 @@
       "signOut": "サインアウト"
     },
     "language": "言語",
-    "search": "検索"
+    "search": "検索",
+    "shareProject": "プロジェクトを共有"
   },
   "footer": {
     "about": "Velxioは、ブラウザ上で完全に動作する無料のオープンソース回路・マイクロコントローラシミュレータです。Arduino、ESP32、RP2040、ATtiny85に対応し、SPICE精度のアナログ同時シミュレーションを提供します。メーカー、学生、組み込みエンジニアが実践的に学ぶために作られました。AGPLv3ライセンス。"
diff --git a/frontend/src/i18n/locales/ja/common2.json b/frontend/src/i18n/locales/ja/common2.json
index 3e74c4f8..d3e0b4e3 100644
--- a/frontend/src/i18n/locales/ja/common2.json
+++ b/frontend/src/i18n/locales/ja/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "サインアップ不要。100% ブラウザで動作。無料でオープンソース。",
       "openEditor": "エディタを開く"
     }
-  },
-  "header": {
-    "shareProject": "プロジェクトを共有"
   }
 }
diff --git a/frontend/src/i18n/locales/pt-br/common.json b/frontend/src/i18n/locales/pt-br/common.json
index 5058379d..95e00793 100644
--- a/frontend/src/i18n/locales/pt-br/common.json
+++ b/frontend/src/i18n/locales/pt-br/common.json
@@ -23,7 +23,8 @@
       "signOut": "Sair"
     },
     "language": "Idioma",
-    "search": "Pesquisar"
+    "search": "Pesquisar",
+    "shareProject": "Compartilhar projeto"
   },
   "footer": {
     "about": "Velxio é um simulador gratuito e de código aberto de circuitos e microcontroladores que roda inteiramente no seu navegador. Arduino, ESP32, RP2040 e ATtiny85, com co-simulação analógica precisa em SPICE. Construído para makers, estudantes e engenheiros embarcados que aprendem na prática. AGPLv3."
diff --git a/frontend/src/i18n/locales/pt-br/common2.json b/frontend/src/i18n/locales/pt-br/common2.json
index 27680cd6..fab7d433 100644
--- a/frontend/src/i18n/locales/pt-br/common2.json
+++ b/frontend/src/i18n/locales/pt-br/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "Sem necessidade de cadastro. Roda 100% no seu navegador. Gratuito e de código aberto.",
       "openEditor": "Abrir Editor"
     }
-  },
-  "header": {
-    "shareProject": "Compartilhar projeto"
   }
 }
diff --git a/frontend/src/i18n/locales/ru/common.json b/frontend/src/i18n/locales/ru/common.json
index 94777c6b..797917ff 100644
--- a/frontend/src/i18n/locales/ru/common.json
+++ b/frontend/src/i18n/locales/ru/common.json
@@ -23,7 +23,8 @@
       "signOut": "Выйти"
     },
     "language": "Язык",
-    "search": "Поиск"
+    "search": "Поиск",
+    "shareProject": "Поделиться проектом"
   },
   "footer": {
     "about": "Velxio — это бесплатный симулятор цепей и микроконтроллеров с открытым исходным кодом, работающий прямо в браузере. Arduino, ESP32, RP2040 и ATtiny85 с аналоговым ко-симулятором на SPICE. Создан для любителей, студентов и инженеров, изучающих встраиваемые системы на практике. AGPLv3."
diff --git a/frontend/src/i18n/locales/ru/common2.json b/frontend/src/i18n/locales/ru/common2.json
index 6c4c1310..f38116d2 100644
--- a/frontend/src/i18n/locales/ru/common2.json
+++ b/frontend/src/i18n/locales/ru/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "Регистрация не требуется. Работает 100% в вашем браузере. Бесплатно и с открытым исходным кодом.",
       "openEditor": "Открыть редактор"
     }
-  },
-  "header": {
-    "shareProject": "Поделиться проектом"
   }
 }
diff --git a/frontend/src/i18n/locales/zh-cn/common.json b/frontend/src/i18n/locales/zh-cn/common.json
index d63db6f6..54336df7 100644
--- a/frontend/src/i18n/locales/zh-cn/common.json
+++ b/frontend/src/i18n/locales/zh-cn/common.json
@@ -23,7 +23,8 @@
       "signOut": "退出"
     },
     "language": "语言",
-    "search": "搜索"
+    "search": "搜索",
+    "shareProject": "分享项目"
   },
   "footer": {
     "about": "Velxio 是一款免费、开源的电路和微控制器模拟器，完全在浏览器中运行。支持 Arduino、ESP32、RP2040 和 ATtiny85，并具有 SPICE 精度的模拟协同仿真。专为通过实践学习的设计者、学生和嵌入式工程师打造。采用 AGPLv3 许可。"
diff --git a/frontend/src/i18n/locales/zh-cn/common2.json b/frontend/src/i18n/locales/zh-cn/common2.json
index 7b3b0675..3eb65f44 100644
--- a/frontend/src/i18n/locales/zh-cn/common2.json
+++ b/frontend/src/i18n/locales/zh-cn/common2.json
@@ -463,8 +463,5 @@
       "subtitle": "无需注册。100% 在浏览器中运行。免费且开源。",
       "openEditor": "打开编辑器"
     }
-  },
-  "header": {
-    "shareProject": "分享项目"
   }
 }