Add Dutch (nl) translation + missing new lines for German (de)

[massar]

Hola Juliana,

Great work on jscommunicator, very useful, thanks!

As a very tiny token of appreciation, here is the the Dutch translation :)

I've also added the missing words for the German one.

[dpocock]

Thanks for this contribution, I am merging it, it will be released in the next update to rtc.debian.org and freephonebox.net

[dpocock]

@JLouback note that I merged this into master, you may want to do a git pull to update your copy of master