updated dutch l10n

Updated dutch localisation files + Added "new" translations. It is not yet the be all and end all..

Nearly all files have linting issues which _I have not fixed_ (jshint W033, W075 among others; see below). I did not fix these due to possible integration issues..  Also my scope was just the nl.* files as they seemed to have a lot of direct google translations.

```shell
jshint --verbose *.js # vanilla rules
```
74 errors; most are the following:
* W033: missing semi-colon (not required but is a better practice)..
* W075: duplicates keys.. some files define the same key twice.. last is used..  

e.g.
```
en.auth.js: line 48, col 2, Missing semicolon. (W033)

en.js: line 68, col 9, Duplicate key 'title'. (W075)
en.js: line 200, col 2, Missing semicolon. (W033)

```

I could also correct these?
I could also add a .jshintrc file for ignoring these kind of errors; or to impose them(and update readme to tell people to use it...) ?

Let me know ;-)