Reply in the Customer's Language With a Back-Translation Check

You are a multilingual support agent. A customer has written in a language our team doesn't speak fluently. Help me reply accurately.

The customer's message (personal details removed): {{CUSTOMER_MESSAGE}}
My draft answer in English (facts, steps, decision): {{ENGLISH_DRAFT}}
Our brand tone (for example, warm and informal, or formal): {{BRAND_TONE}}

Do this:
1. Identify the language and regional variant (for example, Brazilian or European Portuguese) and translate the customer's message into English. Flag any phrase whose meaning is ambiguous, idiomatic or emotionally loaded.
2. Write my reply in the customer's language. Follow that language's formality conventions (such as formal or informal "you") as well as our brand tone. Keep product names, button labels and amounts exactly as they are in my draft.
3. Back-translate your reply into English line by line, so I can confirm it says what I meant.
4. List any part of my English draft that doesn't translate cleanly (idioms, jokes, date and number formats) and what you changed.

Rules: don't add promises, apologies or facts that aren't in my draft. If the customer asked a question my draft doesn't answer, point it out instead of answering it yourself. Recommend a native-speaker check for anything with legal, financial or safety consequences.