How to localize or translate properly

Hello everyone, I want to help the localization of angry ip for Bahasa Indonesia (id). I have read translation guide at https://angryip.org/contribute/. I know I have to translate `messages.properties` to `messages_id.properties`. The problem comes when i read that content of the files. There is good text too translate and it's clear how to translate it, but sometimes there is a text that contain the ampersand character (&) in the middle of the text. I don't know what that means.

For example on this line https://github.com/angryip/ipscan/blob/16bb80bd16e765020d1c6bb5cb7eaecf8d91d940/resources/messages.properties#L67
As you can see, it looks weird, and i have no idea how to translate that text.

Also in these lines
https://github.com/angryip/ipscan/blob/16bb80bd16e765020d1c6bb5cb7eaecf8d91d940/resources/messages.properties#L11-L26
Am I responsible to add `language.id=Bahasa Indonesia`? Since there is no Indonesian translation before. I hope someone could give me guide how to translate it properly. Tagging maintainer @angryziber, if someone could point me out, I'll soon add a PR for Bahasa Indonesia. Thank you