Fix duplicate image generation toast on tool call.

public/locales/zh-cn.json

@@ -2219,7 +2219,7 @@
     "sd_res_1280x720": "1280x720 (16:9，720p，横向壁纸)",
     "sd_res_720x1280": "720x1280 (9:16，720p，纵向壁纸)",
     "<Enter Model ID above>": "<在上方输入模型 ID>",
-    "Generating image": "正在生成图像",
+    "Generating an image": "正在生成图像",
     "Delete the workflow? This action is irreversible.": "删除工作流？此操作无法被撤销。",
     "Enter new workflow name:": "输入新工作流名称：",
     "A workflow with that name already exists": "已存在同名工作流",

public/scripts/extensions/stable-diffusion/index.js

@@ -2871,7 +2871,7 @@ function ensureSelectionExists(setting, selector) {
 function updateGenerationIndicator() {
     if (activeGenerations > 0) {
         const countText = activeGenerations > 1 ? ` (${activeGenerations})` : '';
-        const toastText = `<i class="fa-solid fa-spinner fa-spin"></i> ${t`Generating image`}${countText}...`;
+        const toastText = `<i class="fa-solid fa-spinner fa-spin"></i> ${t`Generating an image`}${countText}...`;
 
         // Show persistent toast if not already showing
         if (!generationToast) {
@@ -5344,7 +5344,6 @@ function registerFunctionTool() {
             const url = await generatePicture(initiators.tool, {}, args.prompt);
             return encodeURI(url);
         },
-        formatMessage: () => 'Generating an image...',
     });
 }