Tools to ease XenForo translation

Hi there, people!

I just started translating the latest XenForo version to Brazilian Portuguese but there are around 5000 lines in the XML language file. Is there any tools to ease the translation work instead of just having to edit the file in a simple text editor? I'm currently using Notepad++ and will be using Xcode in my Mac. Is there a easier way?

Thanks a lot,
Daniel Bittar.