feat(editor): translate EditorToolbar to 9 locales (Editor block 1)

The top toolbar of the editor is now fully localised — compile / run /
stop / reset, the compile-all / run-all variants when multiple boards
are open, the language-mode select, libraries / import / export /
upload-firmware actions, and the missing-library hint banner.

Strings live under editor.toolbar.* in src/i18n/locales/<locale>/common.json.
Hand-translated for all 8 non-English locales. Brand and product
names (Arduino, MicroPython, Ctrl+B, .hex / .bin / .elf / .ihex,
GitHub Sponsors) preserved as-is.

Editor strings still pending: file explorer, file tabs, simulator
canvas, component picker, library manager modal, save / share /
project modals.

frontend/src/components/editor/EditorToolbar.tsx

@@ -1,4 +1,5 @@
 import { useState, useCallback, useRef, useEffect } from 'react';
+import { useTranslation } from 'react-i18next';
 import { useEditorStore } from '../../store/useEditorStore';
 import { useSimulatorStore } from '../../store/useSimulatorStore';
 import type { BoardKind, LanguageMode } from '../../types/board';
@@ -71,6 +72,7 @@ export const EditorToolbar = ({
   centerSlot,
   rightSlot,
 }: EditorToolbarProps) => {
+  const { t } = useTranslation();
   const { files, codeChangedSinceLastCompile, markCompiled } = useEditorStore();
   const {
     boards,
@@ -629,7 +631,7 @@ export const EditorToolbar = ({
                 if (activeBoardId)
                   setBoardLanguageMode(activeBoardId, e.target.value as LanguageMode);
               }}
-              title="Language mode"
+              title={t('editor.toolbar.languageMode')}
               style={{
                 background: '#2d2d2d',
                 color: '#ccc',
@@ -655,12 +657,12 @@ export const EditorToolbar = ({
               className="tb-btn tb-btn-compile"
               title={
                 !activeBoard
-                  ? 'Add a board to compile'
+                  ? t('editor.toolbar.compile.addBoard')
                   : compiling
-                    ? 'Loading…'
+                    ? t('editor.toolbar.compile.loading')
                     : activeBoard?.languageMode === 'micropython'
-                      ? 'Load MicroPython'
-                      : 'Compile (Ctrl+B)'
+                      ? t('editor.toolbar.compile.loadMicropython')
+                      : t('editor.toolbar.compile.compile')
               }
             >
               {compiling ? (
@@ -702,10 +704,10 @@ export const EditorToolbar = ({
               className="tb-btn tb-btn-run"
               title={
                 !activeBoard
-                  ? 'Add a board to run'
+                  ? t('editor.toolbar.run.addBoard')
                   : activeBoard?.languageMode === 'micropython'
-                    ? 'Run MicroPython'
-                    : 'Run (auto-compiles if needed)'
+                    ? t('editor.toolbar.run.runMicropython')
+                    : t('editor.toolbar.run.run')
               }
             >
               <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" stroke="none">
@@ -718,7 +720,7 @@ export const EditorToolbar = ({
               onClick={handleStop}
               disabled={!running}
               className="tb-btn tb-btn-stop"
-              title="Stop"
+              title={t('editor.toolbar.stop')}
             >
               <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" stroke="none">
                 <rect x="3" y="3" width="18" height="18" rx="2" />
@@ -730,7 +732,7 @@ export const EditorToolbar = ({
               onClick={handleReset}
               disabled={!compiledHex && !activeBoard?.compiledProgram}
               className="tb-btn tb-btn-reset"
-              title="Reset"
+              title={t('editor.toolbar.reset')}
             >
               <svg
                 width="18"
@@ -756,7 +758,7 @@ export const EditorToolbar = ({
                   onClick={handleCompileAll}
                   disabled={compileAllRunning}
                   className="tb-btn tb-btn-compile-all"
-                  title="Compile all boards"
+                  title={t('editor.toolbar.compileAll')}
                 >
                   <svg
                     width="18"
@@ -778,7 +780,7 @@ export const EditorToolbar = ({
                   onClick={handleRunAll}
                   disabled={running}
                   className="tb-btn tb-btn-run-all"
-                  title="Run all boards"
+                  title={t('editor.toolbar.runAll')}
                 >
                   <svg width="18" height="18" viewBox="0 0 24 24" fill="currentColor" stroke="none">
                     <polygon points="3,3 11,12 3,21" />
@@ -817,7 +819,7 @@ export const EditorToolbar = ({
                 setLibManagerOpen(true);
               }}
               className="tb-btn-libraries"
-              title="Search and install Arduino libraries"
+              title={t('editor.toolbar.libraries.title')}
             >
               <svg
                 width="16"
@@ -833,7 +835,7 @@ export const EditorToolbar = ({
                 <path d="m3.3 7 8.7 5 8.7-5" />
                 <path d="M12 22V12" />
               </svg>
-              <span className="tb-libraries-label">Libraries</span>
+              <span className="tb-libraries-label">{t('editor.toolbar.libraries.label')}</span>
             </button>
 
             {/* Import zip — was previously hidden in a 3-dot overflow menu;
@@ -842,7 +844,7 @@ export const EditorToolbar = ({
             <button
               onClick={() => importInputRef.current?.click()}
               className="tb-btn"
-              title="Import a project from a .zip file"
+              title={t('editor.toolbar.import')}
             >
               <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                 <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
@@ -853,7 +855,7 @@ export const EditorToolbar = ({
             <button
               onClick={() => handleExport()}
               className="tb-btn"
-              title="Export the current project as a .zip file"
+              title={t('editor.toolbar.export')}
             >
               <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                 <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4" />
@@ -864,7 +866,7 @@ export const EditorToolbar = ({
             <button
               onClick={() => firmwareInputRef.current?.click()}
               className="tb-btn"
-              title="Upload firmware (.hex, .bin, .elf, .ihex) to bypass compilation"
+              title={t('editor.toolbar.uploadFirmware')}
             >
               <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                 <path d="M14.7 6.3a1 1 0 0 0 0 1.4l1.6 1.6a1 1 0 0 0 1.4 0l3.77-3.77a6 6 0 0 1-7.94 7.94l-6.91 6.91a2.12 2.12 0 0 1-3-3l6.91-6.91a6 6 0 0 1 7.94-7.94l-3.76 3.76z" />
@@ -879,7 +881,7 @@ export const EditorToolbar = ({
             <button
               onClick={() => setConsoleOpen((v) => !v)}
               className={`tb-btn tb-btn-output${consoleOpen ? ' tb-btn-output-active' : ''}`}
-              title="Toggle Output Console"
+              title={t('editor.toolbar.toggleConsole')}
             >
               <svg
                 width="18"
@@ -922,7 +924,7 @@ export const EditorToolbar = ({
             <line x1="12" y1="8" x2="12" y2="12" />
             <line x1="12" y1="16" x2="12.01" y2="16" />
           </svg>
-          <span>Missing library? Install it from the</span>
+          <span>{t('editor.toolbar.libHint.message')}</span>
           <button
             className="tb-lib-hint-btn"
             onClick={() => {
@@ -931,12 +933,12 @@ export const EditorToolbar = ({
               setMissingLibHint(false);
             }}
           >
-            Library Manager
+            {t('editor.toolbar.libHint.cta')}
           </button>
           <button
             className="tb-lib-hint-close"
             onClick={() => setMissingLibHint(false)}
-            title="Dismiss"
+            title={t('editor.toolbar.libHint.dismiss')}
           >
             &times;
           </button>

frontend/src/i18n/locales/de/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Über PayPal spenden"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Sprachmodus",
+      "compile": {
+        "addBoard": "Board hinzufügen, um zu kompilieren",
+        "loading": "Wird geladen…",
+        "loadMicropython": "MicroPython laden",
+        "compile": "Kompilieren (Strg+B)"
+      },
+      "run": {
+        "addBoard": "Board hinzufügen, um auszuführen",
+        "runMicropython": "MicroPython ausführen",
+        "run": "Ausführen (kompiliert bei Bedarf automatisch)"
+      },
+      "stop": "Stoppen",
+      "reset": "Zurücksetzen",
+      "compileAll": "Alle Boards kompilieren",
+      "runAll": "Alle Boards ausführen",
+      "libraries": {
+        "title": "Arduino-Bibliotheken suchen und installieren",
+        "label": "Bibliotheken"
+      },
+      "import": "Projekt aus einer .zip-Datei importieren",
+      "export": "Aktuelles Projekt als .zip exportieren",
+      "uploadFirmware": "Firmware (.hex, .bin, .elf, .ihex) hochladen und Kompilierung überspringen",
+      "toggleConsole": "Ausgabekonsole umschalten",
+      "libHint": {
+        "message": "Bibliothek fehlt? Installiere sie über den",
+        "cta": "Bibliotheksmanager",
+        "dismiss": "Schließen"
+      }
+    }
   }
 }

frontend/src/i18n/locales/en/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Donate via PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Language mode",
+      "compile": {
+        "addBoard": "Add a board to compile",
+        "loading": "Loading…",
+        "loadMicropython": "Load MicroPython",
+        "compile": "Compile (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Add a board to run",
+        "runMicropython": "Run MicroPython",
+        "run": "Run (auto-compiles if needed)"
+      },
+      "stop": "Stop",
+      "reset": "Reset",
+      "compileAll": "Compile all boards",
+      "runAll": "Run all boards",
+      "libraries": {
+        "title": "Search and install Arduino libraries",
+        "label": "Libraries"
+      },
+      "import": "Import a project from a .zip file",
+      "export": "Export the current project as a .zip file",
+      "uploadFirmware": "Upload firmware (.hex, .bin, .elf, .ihex) to bypass compilation",
+      "toggleConsole": "Toggle Output Console",
+      "libHint": {
+        "message": "Missing library? Install it from the",
+        "cta": "Library Manager",
+        "dismiss": "Dismiss"
+      }
+    }
   }
 }

frontend/src/i18n/locales/es/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Donar con PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Modo de lenguaje",
+      "compile": {
+        "addBoard": "Añade una placa para compilar",
+        "loading": "Cargando…",
+        "loadMicropython": "Cargar MicroPython",
+        "compile": "Compilar (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Añade una placa para ejecutar",
+        "runMicropython": "Ejecutar MicroPython",
+        "run": "Ejecutar (compila automáticamente si hace falta)"
+      },
+      "stop": "Detener",
+      "reset": "Reiniciar",
+      "compileAll": "Compilar todas las placas",
+      "runAll": "Ejecutar todas las placas",
+      "libraries": {
+        "title": "Buscar e instalar librerías de Arduino",
+        "label": "Librerías"
+      },
+      "import": "Importar un proyecto desde un archivo .zip",
+      "export": "Exportar el proyecto actual como archivo .zip",
+      "uploadFirmware": "Subir firmware (.hex, .bin, .elf, .ihex) para saltar la compilación",
+      "toggleConsole": "Mostrar/ocultar consola de salida",
+      "libHint": {
+        "message": "¿Falta una librería? Instálala desde el",
+        "cta": "Gestor de librerías",
+        "dismiss": "Descartar"
+      }
+    }
   }
 }

frontend/src/i18n/locales/fr/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Faire un don via PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Mode de langage",
+      "compile": {
+        "addBoard": "Ajoutez une carte pour compiler",
+        "loading": "Chargement…",
+        "loadMicropython": "Charger MicroPython",
+        "compile": "Compiler (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Ajoutez une carte pour exécuter",
+        "runMicropython": "Exécuter MicroPython",
+        "run": "Exécuter (compile automatiquement si besoin)"
+      },
+      "stop": "Arrêter",
+      "reset": "Réinitialiser",
+      "compileAll": "Compiler toutes les cartes",
+      "runAll": "Exécuter toutes les cartes",
+      "libraries": {
+        "title": "Rechercher et installer des bibliothèques Arduino",
+        "label": "Bibliothèques"
+      },
+      "import": "Importer un projet depuis un fichier .zip",
+      "export": "Exporter le projet courant en .zip",
+      "uploadFirmware": "Téléverser un firmware (.hex, .bin, .elf, .ihex) pour contourner la compilation",
+      "toggleConsole": "Afficher/masquer la console de sortie",
+      "libHint": {
+        "message": "Bibliothèque manquante ? Installez-la depuis le",
+        "cta": "Gestionnaire de bibliothèques",
+        "dismiss": "Fermer"
+      }
+    }
   }
 }

frontend/src/i18n/locales/it/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Dona con PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Modalità linguaggio",
+      "compile": {
+        "addBoard": "Aggiungi una scheda per compilare",
+        "loading": "Caricamento…",
+        "loadMicropython": "Carica MicroPython",
+        "compile": "Compila (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Aggiungi una scheda per eseguire",
+        "runMicropython": "Esegui MicroPython",
+        "run": "Esegui (compila automaticamente se necessario)"
+      },
+      "stop": "Ferma",
+      "reset": "Reset",
+      "compileAll": "Compila tutte le schede",
+      "runAll": "Esegui tutte le schede",
+      "libraries": {
+        "title": "Cerca e installa librerie Arduino",
+        "label": "Librerie"
+      },
+      "import": "Importa un progetto da un file .zip",
+      "export": "Esporta il progetto corrente come file .zip",
+      "uploadFirmware": "Carica firmware (.hex, .bin, .elf, .ihex) per saltare la compilazione",
+      "toggleConsole": "Mostra/nascondi console di output",
+      "libHint": {
+        "message": "Manca una libreria? Installala dal",
+        "cta": "Gestore Librerie",
+        "dismiss": "Ignora"
+      }
+    }
   }
 }

frontend/src/i18n/locales/ja/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "PayPal で寄付する"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "言語モード",
+      "compile": {
+        "addBoard": "コンパイルするにはボードを追加してください",
+        "loading": "読み込み中…",
+        "loadMicropython": "MicroPython を読み込む",
+        "compile": "コンパイル (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "実行するにはボードを追加してください",
+        "runMicropython": "MicroPython を実行",
+        "run": "実行（必要に応じて自動コンパイル）"
+      },
+      "stop": "停止",
+      "reset": "リセット",
+      "compileAll": "すべてのボードをコンパイル",
+      "runAll": "すべてのボードを実行",
+      "libraries": {
+        "title": "Arduino ライブラリを検索・インストール",
+        "label": "ライブラリ"
+      },
+      "import": ".zip ファイルからプロジェクトをインポート",
+      "export": "現在のプロジェクトを .zip としてエクスポート",
+      "uploadFirmware": "ファームウェア (.hex, .bin, .elf, .ihex) をアップロードしてコンパイルをスキップ",
+      "toggleConsole": "出力コンソールの表示切り替え",
+      "libHint": {
+        "message": "ライブラリが足りませんか？こちらからインストール：",
+        "cta": "ライブラリマネージャー",
+        "dismiss": "閉じる"
+      }
+    }
   }
 }

frontend/src/i18n/locales/pt-br/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Doar via PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Modo de linguagem",
+      "compile": {
+        "addBoard": "Adicione uma placa para compilar",
+        "loading": "Carregando…",
+        "loadMicropython": "Carregar MicroPython",
+        "compile": "Compilar (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Adicione uma placa para executar",
+        "runMicropython": "Executar MicroPython",
+        "run": "Executar (compila automaticamente se necessário)"
+      },
+      "stop": "Parar",
+      "reset": "Reiniciar",
+      "compileAll": "Compilar todas as placas",
+      "runAll": "Executar todas as placas",
+      "libraries": {
+        "title": "Buscar e instalar bibliotecas Arduino",
+        "label": "Bibliotecas"
+      },
+      "import": "Importar um projeto de um arquivo .zip",
+      "export": "Exportar o projeto atual como arquivo .zip",
+      "uploadFirmware": "Enviar firmware (.hex, .bin, .elf, .ihex) para pular a compilação",
+      "toggleConsole": "Alternar console de saída",
+      "libHint": {
+        "message": "Faltando uma biblioteca? Instale a partir do",
+        "cta": "Gerenciador de Bibliotecas",
+        "dismiss": "Dispensar"
+      }
+    }
   }
 }

frontend/src/i18n/locales/ru/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "Пожертвовать через PayPal"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "Режим языка",
+      "compile": {
+        "addBoard": "Добавьте плату, чтобы скомпилировать",
+        "loading": "Загрузка…",
+        "loadMicropython": "Загрузить MicroPython",
+        "compile": "Компилировать (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "Добавьте плату, чтобы запустить",
+        "runMicropython": "Запустить MicroPython",
+        "run": "Запустить (при необходимости компилируется автоматически)"
+      },
+      "stop": "Остановить",
+      "reset": "Сбросить",
+      "compileAll": "Скомпилировать все платы",
+      "runAll": "Запустить все платы",
+      "libraries": {
+        "title": "Поиск и установка библиотек Arduino",
+        "label": "Библиотеки"
+      },
+      "import": "Импорт проекта из .zip",
+      "export": "Экспорт текущего проекта в .zip",
+      "uploadFirmware": "Загрузить прошивку (.hex, .bin, .elf, .ihex) и пропустить компиляцию",
+      "toggleConsole": "Показать/скрыть консоль вывода",
+      "libHint": {
+        "message": "Не хватает библиотеки? Установите её через",
+        "cta": "Менеджер библиотек",
+        "dismiss": "Закрыть"
+      }
+    }
   }
 }

frontend/src/i18n/locales/zh-cn/common.json

@@ -76,5 +76,38 @@
       "ctaSponsors": "GitHub Sponsors",
       "ctaPaypal": "通过 PayPal 捐赠"
     }
+  },
+  "editor": {
+    "toolbar": {
+      "languageMode": "语言模式",
+      "compile": {
+        "addBoard": "请先添加开发板才能编译",
+        "loading": "加载中…",
+        "loadMicropython": "加载 MicroPython",
+        "compile": "编译 (Ctrl+B)"
+      },
+      "run": {
+        "addBoard": "请先添加开发板才能运行",
+        "runMicropython": "运行 MicroPython",
+        "run": "运行（如需要会自动编译）"
+      },
+      "stop": "停止",
+      "reset": "重置",
+      "compileAll": "编译所有开发板",
+      "runAll": "运行所有开发板",
+      "libraries": {
+        "title": "搜索并安装 Arduino 库",
+        "label": "库"
+      },
+      "import": "从 .zip 文件导入项目",
+      "export": "将当前项目导出为 .zip 文件",
+      "uploadFirmware": "上传固件（.hex、.bin、.elf、.ihex）以跳过编译",
+      "toggleConsole": "切换输出控制台",
+      "libHint": {
+        "message": "缺少库？从这里安装",
+        "cta": "库管理器",
+        "dismiss": "关闭"
+      }
+    }
   }
 }