localize hardcoded strings in provider settings UI (#8931)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: Douwe Osinga <douwe@squareup.com>

ui/goose2/src/shared/i18n/locales/en/common.json

@@ -20,10 +20,14 @@
     "remove": "Remove",
     "rename": "Rename",
     "restore": "Restore",
+    "add": "Add",
+    "connect": "Connect",
     "retry": "Retry",
     "run": "Run",
     "running": "Running",
     "save": "Save",
+    "saved": "Saved",
+    "saving": "Saving...",
     "saveChanges": "Save changes",
     "search": "Search",
     "select": "Select",

ui/goose2/src/shared/i18n/locales/en/settings.json

@@ -343,6 +343,14 @@
       "loading": "Loading provider catalog..."
     },
     "disconnect": "Disconnect",
+    "errors": {
+      "fieldRequired": "Enter a value for {{label}}",
+      "fieldsMissing": "Fill in {{fields}}",
+      "loadFailed": "Failed to load provider settings",
+      "removeFailed": "Failed to remove",
+      "saveFailed": "Failed to save",
+      "signInFailed": "Failed to complete sign-in"
+    },
     "models": {
       "description": "AI models power your agents. Goose requires one to work, but some agents bring their own.",
       "notSet": "Not set",

ui/goose2/src/shared/i18n/locales/es/common.json

@@ -20,10 +20,14 @@
     "remove": "Quitar",
     "rename": "Renombrar",
     "restore": "Restaurar",
+    "add": "Agregar",
+    "connect": "Conectar",
     "retry": "Reintentar",
     "run": "Ejecutar",
     "running": "Ejecutando",
     "save": "Guardar",
+    "saved": "Guardado",
+    "saving": "Guardando...",
     "saveChanges": "Guardar cambios",
     "search": "Buscar",
     "select": "Seleccionar",

ui/goose2/src/shared/i18n/locales/es/settings.json

@@ -343,6 +343,14 @@
       "loading": "Cargando catálogo de proveedores..."
     },
     "disconnect": "Desconectar",
+    "errors": {
+      "fieldRequired": "Ingresa un valor para {{label}}",
+      "fieldsMissing": "Completa los campos: {{fields}}",
+      "loadFailed": "No se pudo cargar la configuración del proveedor",
+      "removeFailed": "Error al eliminar",
+      "saveFailed": "Error al guardar",
+      "signInFailed": "No se pudo completar el inicio de sesión"
+    },
     "models": {
       "description": "Necesitas al menos un proveedor de modelos para usar el agente Goose. Algunos agentes pueden traer sus propias conexiones de modelo.",
       "notSet": "No configurado",