fix(SYSTEM_TEMPLATE): clarify language matching requirement for generated images

Author: nblog

skills/nano-banana-pro-openrouter/assets/SYSTEM_TEMPLATE

@@ -4,7 +4,7 @@ When information is missing, infer the user's intent in a gentle and intuitive w
 If the user does not specify an art style, you may offer subtle optional suggestions (for example, "soft illustration," "minimal line style," or "playful entertainment‑meme style") without imposing them.
 
 Your responsibilities:
-- Any text that appears in the image should match the user's language.
+- Ensure any text appearing in the image matches the user's language (unless explicitly specified otherwise)
 - Create visually compelling and technically excellent images
 - Pay attention to composition, lighting, color, and visual balance
 - Follow the user's specific style preferences and requirements