[bisq-network/bisq] [1.5.2] Add extra note for amazon gift cards (#4977)

[m52go]

If this 100 USD soft/recommended cap is kept, my suggested text is below.
- link to wiki instead of Amazon (more thorough and informative for Bisq traders)
- specify that gift cards can only be used on the Amazon site they were purchased from (to my knowledge, this is the real constraint, not currency)

```
payment.amazonGiftCard.info=To pay with Amazon eGift Card, you will need to send an Amazon eGift Card to the BTC seller via your Amazon account. \n\n\
  Bisq will show the BTC seller''s email address or phone number where the gift card should be sent, and you must include the trade ID in the gift \
  card''s message field. Please see the wiki [HYPERLINK:https://bisq.wiki/Amazon_eGift_card] for further details and best practices. \n\n\
  Three important notes:\n\
  - try to send gift cards with amounts of 100 USD or smaller, as Amazon is known to flag larger gift cards as fraudulent\n\
  - try to use creative, believable text for the gift card''s message (e.g., "Happy birthday Susan!") along with the trade ID (and use trader chat \
  to tell your trading peer the reference text you picked so they can verify your payment)\n\
  - Amazon eGift Cards can only be redeemed on the Amazon website they were purchased on (e.g., a gift card purchased on amazon.it can only be redeemed on amazon.it)
```

![Screenshot from 2020-12-20 04-13-24](https://user-images.githubusercontent.com/735155/102709586-15a2e980-42a4-11eb-92aa-3eba61566887.png)

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